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Na+ has completely filled K and L shells. Explain.

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Na has atomic number 11, so its electronic configuration is = 2, 8, 1 

When it gives away its outermost shell single electron it changes to Na+ =10= 2, 8 

The above configuration indicates completely filled K, L shells

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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-shell, thereby completely filling K and L shells.

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