Final answer:
Phosphorus is a nonmetal and a post-transition metal, fluorine is a nonmetal and a halogen, potassium is a metal and an alkali metal, and iron is a metal and a transition metal.
Step-by-step explanation:
The terms that apply to each element are as follows:
- Phosphorus: Nonmetal, post-transition metal
- Fluorine: Nonmetal, halogen
- Potassium: Metal, alkali metal
- Iron: Metal, transition metal
These classifications are based on the periodic table. Phosphorus is a nonmetal and a post-transition metal. Fluorine is a nonmetal and a halogen. Potassium is a metal and an alkali metal. Iron is a metal and a transition metal.