Question

Is hydrogen a solid, liquid, or gas at room temperature?

Answer 1

Hydrogen$\left(\mathrm{H}\right)$:

1. It is the lightest element of the periodic table with $1$ valence electron, it has a tendency to accept $1$ electron and exist in diatomic form.
2. It is gas at room temperature.
3. When subjected to low temperature and high pressure it exists as liquid Hydrogen.
4. At a temperature below $15\mathrm{K}$ it can be found as solid.

Thus, Hydrogen is found in gaseous state at room temperature.