The atomic number of an element whose differentiating electron enters in a d sub-shell:

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Solution

The correct option is B 21
The order for filling orbitals according to Hund's rule and n+l rule is:
$1 s, 2 s, 2 p, 3 s, 3 p, 4 s, 3 d . . . .$
Therefore d-orbitals are filled first for element with atomic number
$= 2 + 8 + 8 + 2 + 1 = 21$ .

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The atomic number of an element whose differentiating electron enters in a d sub-shell:

The correct option is B 21The order for filling orbitals according to Hund's rule and n+l rule is:1s,2s,2p,3s,3p,4s,3d....Therefore d-orbitals are filled first for element with atomic number=2+8+8+2+1=21.

The correct option is B 21
The order for filling orbitals according to Hund's rule and n+l rule is:
$1 s, 2 s, 2 p, 3 s, 3 p, 4 s, 3 d . . . .$
Therefore d-orbitals are filled first for element with atomic number
$= 2 + 8 + 8 + 2 + 1 = 21$ .