Which of the following pairs of elements could possibly be in the same group on the periodic table? a forms a 1+ ion; b forms a 1- ion. a has an atomic number 15; b forms a 3- ion. a tends to form a 2+ ion; b tends to gain two electrons. a tends to gain one electron; b has eight valence electrons.
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Which of the following pairs of elements could possibly be in the same group on the periodic table?...
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