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26-09-2018
Chemistry

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Which of these pairs of elements have the same number of valence electrons? A. phosphorus (P) and chlorine (Cl) B. berylium (Be) and calcium (Ca) C. chlorine (Cl) and helium (He) D. oxygen (O) and carbon (C)

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26-09-2018

D. oxygen(O) and carbon(C)

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