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  • The reason for the filling of 4s-orbital before 3d-orbitals isOption: 1 4s orbital are spherical, and has lower zeff. as compared to 3d

The reason for the filling of 4s-orbital before 3d-orbitals is

Option: 1

4s orbital are spherical, and has lower zeff. as compared to 3d


Option: 2

4s orbitals have higher energy than 3d


Option: 3

both a & b


Option: 4

None of these


Answers (1)

best_answer

As we learnt

 

Why 4s -orbital is filled before 3d-orbitals -

 

The lower the value of Zeff acting on the  3d electron as compared to on 4s electron shows that 3d electron is less tightly bound to the nucleus than the 4s electron.

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Posted by

HARSH KANKARIA

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