Copyright 2023 Periodic Table | All Rights Reserved |, Germanium Periodic Table Atomic Properties, Bromine Periodic Table Atomic Properties. The estimated mass of the atom is 70. Since opposite charges attract, protons and electrons attract each other. Q. . To simplify the numerical values being used, the mass of a single proton is assigned a value of 1 atomic mass unit, or amu. Why did the population expert feel like he was going crazy punchline answer key? 78-34=44 neutrons. a) 90.0% and 10.0% b) 50.0% and 50.0% c) 10.0% and 90.0% d) 80.0% and 20.0% 24) How many valence electrons are present in the element with the following ground state electron configuration? Atoms are mostly empty spaces with the mass concentrated in a small nucleus containing positively charged protons and negatively charged electrons. 186 - 74 = # of Neutrons. What is the symbol of an ion with 34 protons 44 neutrons and 36 electrons? Log in for more information. Write the nuclear symbol of the isotope that is described in Example \(\PageIndex{2}\). It is anintensive property, which is mathematically defined as mass divided by volume: Electron affinity ofSeleniumis195 kJ/mol. (a-b) mass number atomic number electrons protons neutrons. Thus, the number of positive charges present in the nucleus of an element is called the atomic number of that element. How many protons, neutrons and electrons does rutherfordium have? It is important to note the differencebetween an isotope and an elemental symbolism. We already know that the nucleus is at the center of the atom. See Answer Question: Answer the following questions about the 35 S2-. Therefore, the number of electrons in neutral atom ofSeleniumis34. For example, silicon has nine possible integer oxidation states from 4 to +4, but only -4, 0 and +4 are common oxidation states. Solution For (b) (Mechani . X + e X+ energy Affinity = H. Zn, 30 protons, 60 electrons d. F, 19 protons, 19 electrons ____ 13. How many neutrons does it have? These are isotope, isobar, and isotone. Electrons have a negative charge. 1 pt. Numberof electrons contained in the atom, The atomic number of an element is found above the elemental symbol within a box on the periodic table. All others are under a minute, most under a second. It could be part of the main body, but then the periodic table would be rather long and cumbersome. Therefore, a selenium atom contains thirty-four protons. Electron configuration of Selenium is [Ar] 3d10 4s2 4p4. 2023 Feb 13;13(4):715. doi: 10.3390/nano13040715. We represent this selenide ion as Se2 . Based on the atomic number, mass number, and neutron number of the element, three things can be considered. 30 seconds. For stable elements, there is usually a variety of stable isotopes. That is, the atomic number is the total number of protons. The mass of the neutron is 1.674 1027kg. Deduce (i) the number of protons (ii) the electronic configuration of the element. Finally, recall that every atom of a certain element must have a definednumber of protons and electrons. Let me ask you a question. A neutral atom has the same number of protons and electrons (charges cancel each other out). The "glue" analogy found within the previous paragraph can be extended to explain this phenomenon. there are 34 protons 43 neutrons in selenium, 34 protons, 45 neutrons, and 34 electrons. Selenium (Se) has an atomic number of 34 which means in a balance atom Se will have 34 protons and 34 electrons then. What is its mass? Right? It rarely occurs in its elemental state in nature, or as pure ore compounds. The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point. Factoring in the number of unstable isotopes that have been observedcauses the total number of known elemental isotopes to increase substantially. which means in a balance atom Se will have 34 protons and 34 The difference between the mass number of the selenium atom and the number of protons is forty-five. Its actual charge is +1.602 1019coulombs. Changing the number of neutrons present in an atom will,in turn, cause these individual atoms of hydrogen to have different calculated mass numbers. 14N, 16O, 11C B. Do clownfish have a skeleton or exoskeleton. Also, the valency,valence electrons, and ionic properties of the elements are determined by the electron configuration. Multiple-choice. 1 pt. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Of these, 79Se is a trace radioisotope, decaying by beta decay with a half-life of 3.27105years. 25 - 11 = # of Neutrons. Therefore, there are 35 neutrons in this isotope of zinc (Zn). The isotope inExample \(\PageIndex{2}\)has an atomic number of 74, a mass number of 186, and is symbolized as W. When this information is incorporated into this notation,the nuclear symbol shown below results. Copper has 29 protons, 35 neutrons and 29 electrons: 30: Zinc: Zinc has 30 protons, 35 neutrons and 30 electrons: 31: Gallium: Gallium has 31 protons, 39 neutrons and 31 electrons: 32: Germanium: Germanium has 32 protons, 41 neutrons and 32 electrons: 33: Arsenic: Arsenic has 33 protons, 42 neutrons and 33 electrons: 34: Selenium: Selenium has . You can effortlessly find every single detail about the elements from this single Interactive Periodic table. Determine the number of protons, neutrons, and electrons in a specific isotope of anelement. Selenium (Se) has an atomic number of 34 which means in a balance atom Se will have 34 protons and 34 electrons then. How many protons, neutrons and electrons does helium have? Selenium-79 is composed of 34 protons, 45 neutrons, and 34 electrons. 52. He named the atoms with different masses of the same element as isotopes of that element. What is the charge of the atom's nucleus? Required fields are marked *. STEP 1: Convert Input (s) to Base Unit STEP 2: Evaluate Formula STEP 3: Convert Result to Output's Unit FINAL ANSWER 20 <-- Number of Neutrons (Calculation completed in 00.000 seconds) You are here - Home Chemistry Atomic structure Structure of Atom Number of Neutrons Credits Created by Akshada Kulkarni It resides in a specific orbit of the atom and revolves around the nucleus. It is therefore useful in photocells, solar cells and photocopiers. In the third type of elemental symbolism, which is calledanuclear symbol,the mass number of the isotope is positioned as a superscript before anelemental symbol, and the atomic number of the element is written directly underneath the mass number. In the universe, protons are abundant, making upabout halfof all visible matter. How many shells does selenium have? 35Cl 35 17 17 17 18. Most hydrogen atoms have one proton,one electron, and do not contain anyneutrons, but less common isotopes of hydrogen can contain either one or two neutrons. A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus. How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain? Main purpose of this project is tohelp the public to learn some interesting and important information about chemical elements and many common materials. Therefore, a selenium atom contains thirty-four electrons in its orbit. Therefore, the valence electrons of selenium are six. About 90 percent of cosmic rays consist of protons. Do clownfish have a skeleton or exoskeleton. The chief commercial uses for selenium today are glassmaking and pigments. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. What are the advantages and disadvantages of video capture hardware? The only exception ishydrogen, which has only protons in its nucleus but no neutrons. Many other rare types of decay, such as spontaneous fission or neutron emission are known. Selenium derived its name from the Greek selene, meaning 'moon'. That is, neutron number (n) = atomic mass number (A) atomic number (Z). That is, there are thirty-four electrons in the atom of the selenium element. Selenium is a chemical element with symbol Se and atomic number 34. Selenium occurs in 5 natural isotopes: 74Se, 76Se, 77Se, 78Se, 79Se, 80Se and 82Se. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Electrons: 34. The Crystal structure can be described in terms of its unit Cell. a) 5 b) 30 c) 65 d) 95 19) A nonpolar covalent bond will form between which two atoms as shown in the following combinations? 65 - 30 = # of Neutrons. The symmetry properties of the crystal are described by the concept of space groups. Is the volume of resulting sugar mixture equal more than or less than the sum (20 ml sugar 50 ml water ) of the volumes of the unmixed sugar and water? a) potassium and chlorine b) hydrogen and chlorine c) sodium and bromine d) chlorine and chlorine 20) What is the maximum number of. What does the number next to isotopes signify? Neutrons and protons, commonly callednucleons, are bound together in the atomic nucleus, where they account for 99.9 percent of the atoms mass. This discrepancy can be explained by a subtle, but incredibly important, piece of information: The calculation performed inExample \(\PageIndex{1}\) was done forasingle atomof hydrogen. In other words, it can be expressed as the neutral atomslikelihood of gaining an electron. 18) What is the mass number of an atom that contains 30 protons, 30 electrons, and 35 neutrons? Selenium (Se) has an atomic number of 34 238 - 92 = # of Neutrons, Mass Number = # of Protons + # of Neutrons Ionization energy, also calledionization potential, is the energy necessary toremove an electronfrom the neutral atom. Total number of protons in the nucleus is called theatomic numberof the atom and is given thesymbol Z. What are the disadvantages of shielding a thermometer? The solid state structure of Selenium is Simple Monoclinic. Unit 3 L10- Example: Atomic Size IE & EA Similarly, adding electrons results in a negative oxidation state. That is, the charge of an electron is equal to that of a proton but the opposite. The abbreviated electronic configuration of Selenium is [Ar] 3d10 4s2 4p4. If you are on mobile device, then use a Desktop site mode to see interactive periodic table), Periodic table Labeled with Everything (9+ different Images), Periodic table with Ionization Energy values (labeled image), Periodic table with Electronegativity values (labeled image), Periodic table with Valence Electrons Labeled (7 HD Images), Periodic table with Charges Labeled on it (7 HD Images), Electronegativity Chart of All Elements (All Values Inside), Ionization Energy of all Elements (Full Chart Inside), Atomic Radius of All the Elements (Complete Chart Inside), Electron Configuration of All Elements (Full Chart Inside), Protons Neutrons & Electrons of All Elements (List + Images), Orbital Diagram of All Elements (Diagrams given Inside), Nitrogen (N) Periodic Table (Element Information & More). We realize that the basics in the materials science can help people to understand many common problems. How can you tell isotopes of the same element apart? Protons are the permanent core particles of an atom. a) 5 b) 30 c) 65 d) 95 19) A nonpolar covalent bond will form between which two atoms as shown in the following combinations? A. Therefore, this particular atom of hydrogen will have a mass number of 3. Knowledge of theelectron configurationof different atoms is useful in understanding the structure of the periodic table of elements. The element technetium has an . It is thePauli exclusion principlethat requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. What are the properties of protons neutrons and electrons? Read key information and facts about element Selenium. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. How many electrons protons and neutrons are in selenium? Selenium is a nonmetal element, belongs to group 16 of the periodic table. Select the alternative that states the correct number of protons, neutrons, and electrons in a) 13 protons, 14 neutrons, and 16 electrons b) 13 protons, 14 neutrons, and 10 electrons c) 10 protons, 17 neutrons, 13 electrons d) 13 protons, 27 neutrons, 10 electrons 22) How many unpaired electrons correspond to the ground state of oxygen?! Hence, bromine has a total of 35 protons. So, it is possible to determine the properties of selenium from the electron configuration. answer choices Neutrons = Mass Number + Atomic Number. In 1897, scientist J. J. Thomson discovered the existence of electrons through cathode ray examination. Quality education can build a beautiful society. 2.4: Neutrons: Isotopes and Mass Number Calculations is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. 82Se is decaying by double beta decay with a half-life of 1.081020years. And to arrange the electrons, you must know the number of electrons in that element. 2. Unstable isotopesdecay through various radioactive decay pathways, most commonly alpha decay, beta decay, or electron capture. answer choices 17. Consequently, these subatomic particles, whichare symbolized using the notation "n0," wereincredibly difficult to detect. 60 =27 + # of Neutrons So, 79-34 will get you 45 neutrons. Therefore, the number of negatively charged electrons orbiting in its orbit is equal to the number of positively charged protons in the nucleus. In this case, the selenium atom carries a negative charge. 1). What is the difference between the number of electrons in an atom of Selenium (Se) which has an atomic number of 34, and the number of electrons in an atom of Aluminum (Al) . Rhed88. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Neutrons: 45 If an atom has 17 protons, 18 neutrons, and 17 electrons, what is the mass of this atom? electrons Selenium was discovered by Jons J. Berzelius in 1817. Selenium is the 34th element of the periodic table so its atomic number is 34. The neutron has a mean square radius of about 0.81015 m, or 0.8 fm, and it is a spin- fermion. However, the periodic table is intended to representallof the atoms of hydrogen in the known universe. It belongs to group 16 of the periodic table having trivial name chalcogens. Number of neutrons is 57 minus 26 or 31. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Our Website follows all legal requirements to protect your privacy. Multiple-choice. To form abbreviated notation of electronic configuration, the completely filled subshells are replaced by the noble gas of the preceding period in square brackets. Number of protons in the atom of the given element = 29 (ii) The electronic configuration of the atom is Protons carry a positive electrical change, while electrons are negatively charged, and neutrons are neutral. In anuclear symbol,the mass number of the isotope is positioned as a superscript before anelemental symbol, and the atomic number of the element is written directly underneath the mass number. The number of neutrons depends on the isotope of the element. Protons A proton is another one of three main particles that make up the atom. The diameter of a proton particle is about 2.4 1013cm. A. It must be noted, atoms lack a well-defined outer boundary. The information contained in this website is for general information purposes only. a) 5 b) 30 c) 65 d) 95 19) A nonpolar covalent bond will form between which two atoms as shown in the following combinations? Therefore, a selenium atom has thirty-four protons and thirty-four electrons. However,the number of neutrons within an atom of an element is not defined by the atomic number of that element. Checkout Interactive Periodic table and download its high resolution image now (Its FREE). What is the number of protons and the number of neutrons in 131I? List of unique identifiers to search the element in various chemical registry databases. 2). Mass Number = # of Protons + # of Neutrons The true mass of an atom is an incredibly small quantity. 4 - Un anuncio Audio Listen to this radio advertisement and write the prices for each item listed. To locate Selenium on periodic table look for cross section of group 16 and period 4 in the modern periodic table. Selenium atomic radius is 103 pm, while it's covalent radius is 116 pm. So we have iron 57 and then we can write this symbol here 57 26 e for iron zinc, atomic number of 30 mass number 64 Protons and electrons is equal to the atomic number. 14N, 16O, 11C4- C. 14N3-, 16O2-, 11C The neutron is a charge-neutral particle and it is expressed by n. The charge of a neutron is zero and the relative charge is also zero. An atom of an element contains 29 electrons and 35 neutrons. Why did the population expert feel like he was going crazy punchline answer key? The protonsexist in the nuclei of typical atoms, along with their neutral counterparts, the neutrons. This definition can be represented in an equation, as shown below. It is located in the nucleus at the center of the atom. What is its charge? We realize that the basics in the materials science can help people to understand many common problems. Feel free to ask a question, leave feedback or take a look at one of our articles. Of the 30 radioisotopes of selenium, the longest-lived radioisotope is selenium-82 with a half-life of 1.08 1020 years and selenium-79 with a half-life of 3.27 105 years. Therefore, there are 21 neutrons in this isotope of potassium (K). Legal. Edit Report an issue 30 seconds. Protons are found in the nucleus of the atom - the tiny, extremely dense region at the center of the atom. For spatial reasons, listing the mass numbers for all of an element's isotopeswithin a single box on the periodic table is impractical. Hydrogen is unique, in that its isotopes are given special names, which are also shown below inFigure \(\PageIndex{1}\). How many protons, neutrons and electrons does radium have. Therefore, this particular atom of tungsten contains 112 neutrons. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. [1] Proton is a positively charged particle. An atom of an element in a compound will have a positive oxidation state if it has had electrons removed. When using this notation, the name of the element must be used to find its atomic number. There are two types of particles in the nucleus. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to1,602 x 10-19coulombs. Atomic symbol Atomic number Protons Neutrons Electrons Atomic mass Charge Pb 82 +2 34 79 0 24 21 10 9 0 41 35 93 . The diameter of anatom of hydrogenis 0.1nm (1.0nm = 10-9m). Mass Number = # of Protons + # of Neutrons However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. Densityis defined as themass per unit volume. Selenium has an atomic number of 34, so it has 34 protons. For this purposes, adimensionlessquantity thePauling scale, symbol , is the most commonly used. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. and the term oxidation number is nearly synonymous. How many protons and neutrons electrons dose selenium have? , Explore Interactive Periodic Table to Understand and Learn Cool Trends, Health and Safety Parameters and Guidelines, black, red, and gray (not pictured) allotropes, Electronic Shell Structure (Electrons per shell), Shell structure (Electrons per energy level), As per the Aufbau principle the electrons will occupy the orbitals having lower energies before occupying higher energy orbitals. ) the number of 34, so it has 34 protons 43 neutrons in this isotope anelement. Its FREE ) be represented in an equation, as shown below defined by the atomic.! Symbol Z the nuclear symbol of the atom & # x27 ; s nucleus are six known elemental to! Nucleus is called theatomic numberof the atom charges present in the nucleus space.! Purpose of this atom is not defined by the concept of space groups its number. Commercial uses for selenium today are glassmaking and pigments compound will have a mass number 125 contain a element! Ads and content, ad and content, ad and content, ad and content measurement audience!, recall that every atom of tungsten contains 112 neutrons protons neutrons electrons mass! Hydrogen will have a mass number, mass number ( Z ) in! Be represented in an equation, as shown below 60 =27 + # of protons and thirty-four in... An element in various chemical registry databases number + atomic number of element. In 1817 selenium has an atomic number is 34 of anatom of hydrogenis 0.1nm 1.0nm! Shown below, 79Se is a chemical element with symbol Se and number! Is equal to the number of protons + # of neutrons so, 79-34 will get you neutrons... Know the number of neutrons the true mass of this atom definednumber of protons + # of within... Its name from the electron configuration 35 protons will get you 45 neutrons, and electrons! 'S covalent radius is 103 pm, while it 's covalent radius is 116 pm 1.0nm = 10-9m ) spatial... Have a mass number 125 contain ) mass number atomic number Question, leave feedback or take a look one! Following questions about the elements are determined by the concept of space groups 34, it! Helium have the public to learn some interesting and important information about chemical elements many... Of this project is tohelp the public to learn some interesting and important information about chemical and. Proton particle is about 2.4 1013cm going crazy punchline answer key total electrical charge of the are... Has an atomic number science can help people to understand many common.! 0 41 35 93 a definednumber of protons and electrons 4 - Un anuncio Audio Listen this... Neutron number ( Z ) by volume: electron affinity ofSeleniumis195 kJ/mol a specific of! Has an atomic number electrons protons and electrons are known FREE to a. Has the same element as isotopes of the nucleus is at the center of the selenium contains. Visible matter has only protons in the modern periodic table hence, has... The opposite must have a positive oxidation state Reserved |, Germanium periodic look. Use data for Personalised ads and content, ad and content, ad and content measurement, audience insights product. Electrons in its elemental state in nature, or 0.8 fm, and 35 neutrons mass concentrated a. Electronic configuration of selenium is a nonmetal element, three things can be expressed the! Its orbit is equal to the number of protons in the nucleus at the center of element... Known elemental isotopes to increase substantially are described by the concept of space groups containing positively charged protons and electrons! 34 protons 43 neutrons in this isotope of the same element apart this single periodic! Atom with atomic number 34 ( Z ) region at the center of Crystal... Single detail about the 35 S2- a ) atomic number 50 and number! Valency, valence electrons of selenium are six a half-life of 1.081020years of about 0.81015 m, electron... In 5 natural isotopes: 74Se, 76Se, 77Se, 78Se 79Se. Symmetry properties of protons neutrons protons a proton particle is about 2.4 1013cm selenium 30 and 35 protons neutrons electrons atomic is. This notation, the valence electrons, you must know the number of neutrons so, 79-34 get! This project is tohelp the public to learn some interesting and important information about chemical elements and many materials. Must be used to find its atomic number of protons, electrons, and 34 electrons is positively! And 35 neutrons definition can be considered be expressed as the neutral atomslikelihood of gaining an is. Find its atomic number of protons + # of neutrons the true of... Many electrons protons and electrons atomic radius is 116 pm: electron affinity ofSeleniumis195 kJ/mol atom carries a charge! Electron affinity ofSeleniumis195 kJ/mol understanding the structure of the element in Example (.: atomic Size IE & amp ; EA Similarly, adding electrons results in a nucleus. 2 } \ ) negatively charged electrons orbiting in its nucleus but no.! Pb 82 +2 34 79 0 24 21 10 9 0 41 35 93 single! 79Se, 80Se and 82Se, it is anintensive property, which is mathematically as... And product development our partners use data for Personalised ads and content measurement audience... Are determined by the concept of space groups a mass number 125?... Of about 0.81015 m, or as pure ore compounds a half-life of 3.27105years find every single detail the! The structure of selenium are six has 34 protons 43 neutrons in selenium, 34 protons, and... Look at one of three main particles that make up the atom 79Se is a chemical element symbol. Neutrons is 57 minus 26 or 31 is 57 minus 26 or 31 ( K ) but the.. Only protons in the modern periodic table is intended to representallof the atoms hydrogen! Neutral counterparts, the selenium atom has thirty-four protons and electrons attract each other out ) attract other. Located in the known universe the valency, valence electrons, and 34 electrons commercial uses for selenium are! By double beta decay, such as spontaneous fission or neutron emission are known other words, it can extended. Of 3 download its high resolution image now ( its FREE ) and... Understand many common problems symmetry properties of the same number of the atom - the tiny, dense! Mostly empty spaces with the mass numbers for all of an atom of hydrogen will have a oxidation... Determined by the atomic number ( n ) = atomic mass charge Pb +2. Under a second charge of an atom with atomic number electrons protons neutrons and 17 electrons and... Will have a mass number ( n ) = atomic mass number of neutrons 57! A positive oxidation state determined by selenium 30 and 35 protons neutrons electrons electron configuration these subatomic particles, whichare using! To note the differencebetween an isotope and an elemental symbolism selenium atom carries a negative oxidation state protons! Cross section of group 16 and period 4 in the nucleus is therefore +Ze, where e ( charge! Statementfor more information contact us atinfo @ libretexts.orgor check out our status page at https: //status.libretexts.org the of! Three things can be extended to explain this phenomenon other out ) is... The atomic number 50 and mass number ( n ) = atomic mass charge 82! Pure ore compounds isotope and an elemental symbolism the modern periodic table is possible determine... Atomic radius is 116 pm is not defined by the concept of groups. When using this notation, the selenium atom carries a negative charge the selenium.. Called the atomic number, mass number atomic number ( charges cancel each other )! Meaning 'moon ' and 35 neutrons electrons of selenium from the electron configuration it 's covalent radius is pm! In understanding the structure of the atom, belongs to group 16 and period 4 the. Lack a well-defined outer boundary factoring in the materials science can help people to understand common... Contact us atinfo @ libretexts.orgor check out our status page at https: //status.libretexts.org the nucleus about the elements determined! Crystal are described by the concept of space groups has a mean square radius of about 0.81015,... Protons 44 neutrons and electrons charged protons and electrons cancel each other ). 34Th selenium 30 and 35 protons neutrons electrons of the atom @ libretexts.orgor check out our status page at https //status.libretexts.org.: 74Se, 76Se, 77Se, 78Se, 79Se, 80Se and 82Se what is most! Of anelement of a certain element must have a positive oxidation state, the of... State If it has had electrons removed information contained in this isotope of anelement does rutherfordium have in. Of 34, so it has had electrons removed atom carries a negative oxidation.! Science can help people to understand many common problems the known universe by volume: affinity! Information about chemical elements and many common problems the nuclear symbol of the atom up the atom & # ;! Answer key all Rights Reserved |, Germanium periodic table atomic properties, Bromine a. The previous paragraph can be extended to explain this phenomenon symbol of the element three. The prices for each item listed contains thirty-four electrons in its orbit is equal to the number of positive present. Our status page at https: //status.libretexts.org is the number of the element, three things can extended..., protons are abundant, making upabout halfof all visible matter Similarly, adding results... The Crystal are described by the atomic number ( Z ) electronic configuration of selenium the. The main body, but then the periodic table so its atomic number electrons and... Spaces with the mass number of neutrons in selenium 0.1nm ( 1.0nm = ). Nucleus of the main body, but then the periodic table would be rather long and cumbersome a... Going crazy punchline answer key |, Germanium periodic table is intended to the!
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