Question

the model below represents a molecule of hydrogen. hydrogen gas was once used to make large airships, such as blimps, float. it is no longer used in airships because it catches fire easily. complete the statement. hydrogen is. an elementary substance a compound

Explanation:

An elementary substance consists of only one type of atom. Hydrogen (\(H\)) has only hydrogen atoms. A compound has two or more different types of atoms chemically bonded. Since hydrogen has only one type of atom (\(H\)), it is an elementary substance.

Answer:

an elementary substance