Hydrogen can bond to itself. Hydrogen makes positive ions. Hydrogen is a gas at room temperature. Hydrogen is combustible.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: 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?
Possibilities:
- 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.