$N a^{+}$ has completely filled K and L shells. Explain

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Solution

Sodium atom (Na), has atomic number = 11
Number of protons = 11
Number of electrons = 11
Electronic configuration of Na = $K, L, M \Rightarrow 2, 8, 1$
Sodium atom (Na) looses 1 electron to become stable and form Na+ ion. Hen it has completely filled K and L shells.

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