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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ErebusX ErebusX

23-03-2017

Beryllium (Be) and Calcium (Ca)

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