The mass number of an element is 27. If it has 14 neutrons then valence shell of this element is :

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Solution

The correct option is B M
The given element is having 14 nutrons and 27 mass number means number of electrons or protons are $(z - n)$ $27 - 14 = 13$ each.

Distribution of electrons according to $2 n^{2}$ (n = principal quantum number) is $2 (K), 8 (L), 3 (M)$ . Hence, the valence shell of this element is M.

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