For which gas-phase atoms are the 4s orbitals lower in energy than the 3d orbitals? I. H II. K | Atomic Structure

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Atomic StructureMCQ

Question

For which gas-phase atoms are the 4s orbitals lower in energy than the 3d orbitals?
I. H
II. K

I only

II only

✓ Correct

Both I and II

Neither I nor II

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