Question

the box orbital diagram corresponding to d^5 is 1
the box orbital diagram corresponding to d^0 is 2

Explanation:

1. For $d^5$, according to Hund's rule, electrons fill degenerate orbitals singly with parallel spins first. The d - subshell has 5 orbitals, so for $d^5$, there will be one electron in each of the 5 d - orbitals with parallel spins.
2. For $d^0$, there are no electrons in the d - subshell, so all 5 d - orbitals are empty.

Answer:

1. ee.
2. a.