Question

Which is the highest energy of this subshells 2s,4s,3d

Answer 1

Energy of the subshell ( orbitals) is decided by n+ l rule. Orbitals with a lower n + l value are filled before those with higher n + l values. Here, n stands for the principal quantum number and l stands for azimuthal quantum number.

Explanation:

2s = 2 + 0 = 2.

4s = 4 + 0 = 4.

3d = 3 + 2 = 5.

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