An atom X has the K, L and M shells completely filled, what is the atomic number of the atom?

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Solution

The correct option is D 28
The maximum number of electrons in the shell in given as:

K shell: n = 1 ; The maximum number of electrons = ${2 n}^{2}$ = 2

L shell: n = 2 ; The maximum number of electrons = ${2 n}^{2}$ = 8

M shell: n = 3 ; The maximum number of electrons = ${2 n}^{2}$ = 18

Since, K, L and M shells of the atom are completely filled, they will accommodate the maximum number of electrons. The total number of electrons = Atomic Number = 2 + 8 + 18 = 28

The atomic number of the atom will be 28.

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