jackvalen jackvalen
  • 23-03-2017
  • Chemistry
contestada

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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  • 23-03-2017
Beryllium (Be) and Calcium (Ca)
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