Question

1. if a substance is only one type of atom, it is an ________________________

Explanation:

An element is defined as a pure substance that consists of only one type of atom. For example, oxygen gas (\(O_2\)) is made up of oxygen atoms. Compounds are made of two or more different types of atoms chemically combined (e.g., \(H_2O\) has hydrogen and oxygen atoms). Mixtures contain two or more substances (elements or compounds) physically mixed. Since the question states a substance with only one type of atom, the concept of an element fits.

Answer:

element