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Chemistry, 26.07.2019 09:20 emilyturchon
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 (p) and chlo...
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