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Q.

The order of filling of electrons in the orbitals of an atom will be

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a

$3 d, 4 s, 4 p, 4 d, 5 s$

b

$5 s, 4 p, 3 d, 4 d, 5 s$

c

$3 d, 4 p, 4 s, 4 d, 5 s$

d

$4 s, 3 d, 4 p, 5 s, 4 d$

answer is B.

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Detailed Solution

Energy of orbitals is based on Aufbau principle.(n+l) value increases energy increases for different “n” values.

When (n+l) value is same higher the “n” value higher the energy

orbital	n value	l value	n+l value
4s	4	0	4
3d	3	2	5
4p	4	1	5
5s	5	0	5
4d	4	2	6

Increasing order : 4s<3d<4p<5s<4d

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