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Unit 3 Pop Quiz #2 Identify the element. Identify the element. 194
Platinum Silver Argon Cadmium 194 126.9 amu 80 2 A valence electron is an electron in the outermost energy level of an atom. Identify the element. 78 protons 47 electrons in neutral atom 1s22s22p63s23p6 [Kr]5s24d10 What is the mass number of a mercury atom with 114 neutrons? Write the isotopic notation for a tin atom with 76 neutrons. What is the atomic mass for iodine? What is the mass number of the most abundant isotope of bromine? How many electrons can an individual orbital hold? Define valence electron. Draw the Lewis dot diagram for As. Sn 50 126 • As
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