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

Explanation

The atomic number of sodium is 11 .
Distribution of electrons `{:(K , L , M) , (2 , 8 , 1):}`
A positively charged ion is formed by loosing electrons . The sodium atom looses one electron and forms sodium ion `(Na^(+))` .
The distribution of electron in sodium ion is `{:( K , L) , (2 , 8):}`
Thus `Na^(+)` has completely filled K and L shells since the maximum capacity of K shell is 2 and the maximum capacity of L shell is 8 .