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The order of filling of electrons in the orbitals of an atom will be

1. 3d, 4s, 4p, 4d, 5s
2. 4s, 3d, 4p, 5s, 4d
3. 5s, 4p, 3d, 4d, 5s
4. 3d, 4p, 4s, 4d, 5s

Correct answer: 4s, 3d, 4p, 5s, 4d

Solution

The order of filling of orbitals follows the Aufbau principle, which states that orbitals are filled in increasing order of their energy levels. The correct sequence is 4s, 3d, 4p, 5s, 4d.

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