When 3d orbital is complete, the next entering electron goes into:
Correct answer: C. 4p
- A. 4f
- B. 4s
- C. 4p
- D. 4d
Explanation
The correct order of electron orbital filling is determined by the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to the highest. The sequence is: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, and so on. After the 3d orbitals are complete, the next electrons go into the 4p orbitals, making 4p the correct answer. Options 4f and 4d are filled much later in the sequence, and 4s is filled before 3d.
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