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Which of these pairs of elements have the same number of valence electrons? (1 points) A) hydrogen (H) and helium (He) B) sodium (Na) and potassium (K) C) carbon (C) and oxygen (O) D) boron (B)
and beryllium (Be)
B) sodium (Na) and potassium (K)
Expert answered|workaholicmom|Points 4587|
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Asked 6/13/2011 7:56:34 AM
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