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4 votes
Which of these pairs of elements have the same number of valence electrons

phosphorus (P) and chlorine (Cl)
beryllium (Be) and calcium (Ca)
chlorine (Cl) and helium (He)
oxygen (O) and carbon (C)

1 Answer

3 votes
Beryllium (Be) and Calcium (Ca)
User HNygard
by
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