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Chemistry, 22.10.2019 03:20 live4dramaoy0yf9

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)

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Which of these pairs of elements have the same number of valence electrons
phosphorus (p) and...

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