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The lobes of which orbital(s) lie entirely within the nodal plane of the px orbital?

1. py
2. pz
3. dz²
4. dxy

Correct answer: py

Solution

px has its nodal plane at x=0 (the yz-plane). Orbitals with lobes lying in the yz-plane: py (lobes along +-y) and pz (lobes along +-z). dxy has lobes in the xy-plane - not the yz-plane. dz² has lobes along z plus a doughnut ring in the xy-plane - not entirely in the yz-plane. So py and pz both satisfy the condition. Among the options, py is the primary correct answer (pz is also correct).

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