In this worksheet, we will practice using Hund's rules to predict the electron configurations of atoms and favored spin and momentum quantum numbers.

**Q1: **

One of the p orbitals of an unknown element is half filled. Assuming that Hund’s rule is upheld,
which of the following elements could **not** be the unknown element?

- AGallium
- BSilicon
- CIodine
- DXenon

**Q2: **

The following term symbols correspond to the ground electronic state of atomic carbon, . Use Hund’s rule to predict which of these levels is lowest in energy.

- A
^{3}P_{2} - B
^{1}S_{0} - C
^{1}D_{2} - D
^{3}P_{0}

**Q3: **

The electronic ground state of a multielectron atom is determined by applying Hund’s rules:

- The state with the largest total orbital angular momentum has the lowest energy.
- The state with the maximum multiplicity has the lowest energy.
- If the outermost subshell is half-filled or less, the state with the lowest total angular momentum has the lowest energy.

In which order are these rules applied?

- A1, 3, 2
- B1, 2, 3
- C2, 3, 1
- D2, 1, 3
- E3, 2, 1