Question

what is the valence shell of phosphorus

Answer 1

The highest-numbered shell is the thirdshell, which has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. That gives a total of 5electrons, so neutral phosphorusatoms have 5 valence electrons. The 10 remaining electrons, from the first and second shells, are core electrons.

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