Question

Which is lighter Hydrogen or Helium?

Answer 1

1. Hydrogen and Helium is the chemical compound present in the periodic table.
2. The atomic number of Hydrogen is $1$and that of Helium is $2$.
3. The electronic configuration of Hydrogen and Helium is $1{\mathrm{s}}^1$ and $1{\mathrm{s}}^2$respectively.
4. Therefore, Hydrogen is the lightest element on the periodic table and Helium is the second lightest element.
5. Hydrogen is the only element that exists without neutrons.
6. It can be obtained from hydrocarbons but can not be found naturally in its pure form.
7. Hydrogen can be used in the making of many compounds and is also used for industrial purposes.