Question

Is there a gas lighter than helium?

Answer 1

Explanation:

There exists a gas that is less dense than helium. Hydrogen is the only gas lighter than helium.

Helium: Helium is found in the form of helium gas ($\mathrm{He}$) with only two protons, The first element of the noble gas group.

1. It is an odourless, colourless gas. It is a single-atom gas.
2. The second-lightest gas and the gas with the lowest boiling point is helium.
3. Helium gas ($\mathrm{He}$) has an atomic mass of $4$grams.
4. Hydrogen and helium gases are used in the balloons.
5. Helium is a noble gas that is lighter than air.
6. It is inert because it is a noble gas.
7. Helium gas, not hydrogen gas, is used to fill the balloons.
8. This is due to the fact that hydrogen is lighter than air and helium.
9. On the other hand, hydrogen gas is not used as it is highly explosive and flammable

Hence, Hydrogen is a gas lighter than helium.