For an element (Z=25), how many electrons are present in the "N" shell in its ground state?

13

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2

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15

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3

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Solution

The correct option is A $2$
25 is atomic number of Manganese.
Electronic Configuration: $[A r] 4 s^{2} 3 d^{5}$
So, there are 2 electrons in the fourth(Nth) shell.

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

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