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Orbital A with highlighted nodal planes
Orbital B with highlighted nodal planes
Correct! The HOMO is lower in energy than the LUMO (the HOMO is occupied, while the LUMO is unoccupied, and electrons fill orbitals in the order of increasing energy). One way in which you can tell the relative energy order of these two orbitals is by comparing the number of nodes - a higher number of nodes correlates to higher energy, and as seen in the illustrations, orbital B has more nodes than orbital A, so it is higher in energy, and hence it is the LUMO.
Correct! The HOMO is lower in energy than the LUMO (the HOMO is occupied, while the LUMO is unoccupied, and electrons fill orbitals in the order of increasing energy). One way in which you can tell the relative energy order of these two orbitals is by comparing the number of nodes - a higher number of nodes correlates to higher energy, and as seen in the illustrations, orbital B has more nodes than orbital A, so it is higher in energy, and hence it is the LUMO.
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