Q. According to Aufbau principle, which orbital fills after 4s?

औफबाउ सिद्धांत के अनुसार, 4s के बाद कौन सा कक्षक भरता है?

A
3d
3डी
B
4p
4पी
C
4d
4डी
D
5s

Explanation

The filling order follows energy levels, and after 4s, electrons fill the 3d orbitals.

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