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Q.

Choose the correct option for the filling of electrons in the orbitals of an atom 

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a

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

b

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

c

4s, 3d, 4p, 5s, 4d 

d

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

answer is D.

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Detailed Solution

The sequence of energy level can be remembered by the systematic diagram as shown below.

Question Image

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hence, the correct order is 1s, 2s, 2p, 3s, 4s, 3d, 4p, 5s, 4d, 5p, 4f, 5d, 6p,7s.

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