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If K and L shells of an atom are full, t...

If K and L shells of an atom are full, then what would be the total number of electrons in the atom?

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The maximum number of electrons that can occupy K and L-shells of an atom are 2 and 8 respectively. Therefore, if K and L-shells of an atom are full, then the total number of electrons in the atom would be (2 + 8) = 10 electrons.
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