2.6: Arrangements of Electrons - Chemistry LibreTexts
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Web ResultJul 22, 2022 · Phosphorus has electron configuration, 1s 2 2s 2 2p 6 3s 2 3p 3. The highest-numbered shell is the third shell (3s 2 3p 3): 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. That gives a total of 5 valence electrons. The 10 inner shell (core) electrons, 1s 2 2s 2 2p 6 can be replaced by [Ne] (see Figure \(\PageIndex{3}\)).
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