how to find the number of valence electron in an atom

Dear student

The number of valence electrons in the outer shell of an atom are the valence electrons. For example, Sodium has 2,8,1 configuration. There is one valence electron in sodium
Please refer to the following link:

https://www.meritnation.com/ask-answer/question/what-is-valency-of-an-atom/academics/562300

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