Na⁺ has K and L-filled shells. Explain

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Solution

Sodium (Na) atom with atomic number 11 has the electronic configuration 2,8,1.
Na⁺ ion is formed when Na atom loses one electron from its outermost shell i.e. M shell acquiring the electronic configuration 2,8.
Electronic configuration of Na⁺ ion is 2,8. (K,L)
The K and L shells are completely filled as their maximum capacity is 2 and 8 electrons respectively.

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