If the 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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Solution

Number of electrons in a shell
Maximum number of electrons that can occupy the K shell $= 2$
Maximum number of electrons that can occupy the L shell $= 8$
Total number of electrons in the atom $= 2 + 8 = 10$
If the K and L shells of an atom are full, then there would be 10 electrons in the atom.

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