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For the main group elements (s and p blocks), valence electrons are the electrons in the outermost (highest energy) s and p sublevels. The number of valence electrons for the main group elements are as follows:

Group 1 - 1 valence electron

Group 2 - 2 valence electrons

Group 13 - 3 valence electrons (13-10)

Group 14 - 4 valence electrons (14-10)

Group 15 - 5 valence electrons (15-10)

Group 16 - 6 valence electrons (16-10)

Group 17 - 7 valence electrons (17-10)

Group 18 - 8 valence electrons (18-10)

In transition metals, some inner-shell electrons are also valence electrons, so the number of valence electrons is not as easy to predict.

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