Question

Is potassium a metal or nonmetal?

Answer 1

1. Metal: The elements which can lose their electrons easily and form a cation are called metal. Metal is an electropositive element. Example: Sodium($\mathbf{Na}$), Magnesium($\mathbf{Mg}$), Iron($\mathbf{Fe}$), etc.
2. Nonmetal: The element that can accept the electron and form an anion is called nonmetal. Example: Carbon($\mathbf{C}$), Oxygen($\mathbf{O}$), Chlorine($\mathbf{Cl}$), etc.
3. Potassium is a metal studied in an s-block element.
4. All the s block elements are metal.
5. Potassium can donate its electron.
6. The tendency of forming cation of potassium is very high.

Hence, Potassium is a metal.