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Question

The atomic number (Z) of an element is 25. In its ground state, how many electrons are present in the N shell:

A
13
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B
2
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C
15
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D
3
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Solution

The correct option is B 2
The electronic configuration is 2,8,13,2. Thus, K, L, M and N shells will have 2,8,13,2 electrons respectively.
The element is manganese, a transition metal whose electronic configuration can also be represented as [Ar]3d54s2.

2 electrons are present in the N shell of the atom of an element with atomic number 25.

So, the correct option is B

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