CHEM 121 glossary
d orbital
An orbital with , first found in the shell. There are five: four are cloverleaf-shaped with two nodal planes, and has two lobes along plus a ring, with two conical nodes.
Example
3d has 2 angular nodes and no radial node; 4d has 2 angular and 1 radial. The five 3d orbitals hold up to 10 electrons, the ten columns of the first transition series.