Question

potassium (k)
element
compound
mixture
element
compound
mixture

Explanation:

An element is a pure substance made of only one type of atom. Potassium (K) is a single - type atom entity and cannot be broken down into simpler substances by chemical means. A compound is made of two or more different types of atoms chemically bonded together, and a mixture is a combination of two or more substances that are not chemically combined. Since potassium consists of only potassium atoms, it is an element.

Answer:

Element