# Q. 9.    $Na^{+}$ has completely filled $\inline K$ and $\inline L$ shells. Explain.

The atomic number of Na = 11

No. of electrons in Na atom = 11

In $Na^{+}$ ,the positive charge is obtained due to the loss of one electron from M shell of Na atom.

So, No. of electrons in Na+ ion = 11 -1 = 10

Hence, electronic configuration of Na+ = 2, 8

In Na+, K and L shells are completely filled since K shell can have a maximum of 2 electrons and L shell can have a maximum of 8 electrons.

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