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What is core electrons and valence e...

What is core electrons and valence electron ?

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Care electron : The electron in the `He^(2) Ne^(10) Ar^(18)`
Valence electrons : After completely filled shells electronic shell with the highest principal quantum number are called valence electron of 3s and 4 of 3p are valence electron.
Example , `S^(16) (Ne) 3s^(2) 3p^(4) .` in this two electron of 3s and 4 of 3p are valence electron.
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