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Atomic Number and Mass Number

The atomic nu...

Question

The atomic number (Z) of an element is 25 in its ground state. The number of electrons in its N shell is:

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 A 2
The electronic configuration of element with atomic no. 25 is $[A r] 3 d^{5} 4 s^{2}$ . It has 2 electrons in 4th i.e. N shell.

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