Hydrogen can bond to itself. Hydrogen makes positive ions. Hydrogen is a gas at room temperature. Hydrogen is combustible.
Hydrogen is located on the left side of the periodic table in the same column as the alkali metals, but it has characteristics of a nonmetal. Which of the following is a physical property of hydrogen?

Options:
- Hydrogen can bond to itself.
- Hydrogen makes positive ions.
- Hydrogen is a gas at room temperature.
- Hydrogen is combustible.

Hydrogen is a gas at room temperature.