Answer :
The set (C. 3s, 3p, 4s, 3d) is not in the order of lowest energy to highest energy.
The order of electron energy levels in an atom is determined by the principal quantum number (n). In general, the energy levels increase with higher values of n. Within a given energy level, sublevels are ordered based on their angular momentum quantum number (l), with s < p < d < f.
The correct order of filling electron energy levels is as follows: 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < ... In set (C), the 4s sublevel appears before the 3d sublevel, which is not in accordance with the expected order of increasing energy. The correct order should be: 3s < 3p < 3d < 4s. Sets (A), (B), and (D) are all in the correct order of increasing energy levels.
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Answer:
D
Explanation:
energy level order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s... (as periodic table shows)
