How do you calculate the number of valence electrons in an atom?

The valence electrons (VE) are the electrons in the outer shell of an atom. These are involved in forming bonds to adjacent atoms. For neutral atoms, the number of valence electrons is equal to the atom’s main group number. For example, Ca+2 has zero valence electrons. Ca normally has 2 valence electrons but with a 2+ charge it is missing two electrons. From periodic table itself we can find the valence electrons easily.

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