Na+ have completely filled K and L shells explain

An atom of Na has a total of 11 electrons. Its electronic configuration is 2, 8, 1. But, Na+ ion has one electron less than Na atom i.e. it has 10 electrons. Therefore, 2 electrons go to K-shell and 8 electrons go to L-electrons, thereby completely filling K and L shells.

Mathematically

atomic number of sodium (Na) = 11

No. of electrons in Na = 11

No. of electrons in Na+ = 11 – 1 = 10

Electronic configuration of Na+ → 2, 8

Thus, in Na+, K and L shells are completely filled.

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