Chemistry, 29.01.2020 03:03, cocoapop

Which of these pairs of elements have the same number of valence electrons?

phosphorus (p) and chlorine (cl)

berylium (be) and calcium (ca)

chlorine (cl) and helium (he)

oxygen (o) and carbon (c)

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Which of these pairs of elements have the same number of valence electrons?

phosphorus...