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How do you determine the valence electrons of an atom based on its electron configuration?​

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Answer:

How do you determine the valence electrons of an atom based on its electron configuration?

So to get number of valence electron of any element just count the number of electrons in its last shell. In other words count the number of electrons from the last s subshell. so last s subshell is 2s. So count no of electrons from thereafter i.e no of electrons in 2s and 2p.

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Explanation:

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