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Q.

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

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a

13

b

2

c

15

d

3

answer is B.

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Detailed Solution

Atomic number = 25. The element is Mn.

The electronic configuration of Mn is 1s²2s²2p⁶3s²3p⁶4s²3d⁵.

N- shell is 4th shell.

∴ n = 4

The number of electrons present in n = 4 is 2.

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