Question

question 20 1.66 pts oxygen (o) element compound mixture element compound mixture

Explanation:

An element is a pure substance made of only one type of atom. Oxygen (O) is composed of oxygen - atoms only and cannot be broken down into simpler substances by chemical means. A compound is made of two or more different types of atoms chemically combined, and a mixture is a combination of two or more substances that are not chemically combined.

Answer:

A. Element