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Which set of symbols represents atoms with valence electrons in the same electron shell? (1) Ba, Br, Bi (3) O, S, Te(2) Sr, Sn, I (4) Mn, Hg, Cu

Which set of symbols represents atoms with valence electrons in the same electron shell? (1) Ba, Br, Bi (3) O, S, Te(2) Sr, Sn, I (4) Mn, Hg, Cu
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Which set of symbols represents atoms with valence electrons in the same electron shell?

(1) Ba, Br, Bi (3) O, S, Te(2) Sr, Sn, I (4) Mn, Hg, Cu

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User Roberto Nunes
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1 Answer

1 vote
Answer=2

Sr,Sn, and I have their valance electrons in the same electron shell, we know this because they are in the same period (row) on the periodic table.
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User Rodders
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