Chemistry, 02.01.2020 11:31, shyannehamilton1183

Which of these pairs of elements have the same number of valence electrons?
oxygen (o) and bromine (br)
selenium (se) and bromine (br)
carbon (c) and lead (pb)
oxygen (o) and carbon (c)
sodium (na) and magnesium (mg)

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Which of these pairs of elements have the same number of valence electrons?
oxygen (o) and br...