Which of the following orbital wil be filled first than 4p?
Correct answer: C. 3d
- A. 4s
- B. 2p
- C. 3d
- D. 1s
Explanation
In the Aufbau principle, electrons fill the lowest energy orbitals first. So, the 3d orbital will be filled before the 4p orbital.The energy order is ; 1s,2s,2p,3s,3p,4s,3d,4p.
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