Question

${}_{86}{}^{222}\mathrm{Rn}$ is an isotope of the noble gas radon.

How many protons, neutrons and electrons are present in one atom of the element?

Answer 1

1. The atomic number number of an element is same as proton number.
2. $\mathrm{Atomic}\mathrm{number}=\mathrm{Number}\mathrm{of}\mathrm{protons}=\mathrm{Number}\mathrm{of}\mathrm{electrons}$
3. $\mathrm{Mass}\mathrm{number}-\mathrm{Atomic}\mathrm{number}=\mathrm{Neutron}\mathrm{number}$
4. The atomic number of $\mathrm{Rn}$ = $86$
5. Proton number = $86$
6. Electron number = $86$
7. Neutron = $222-86=136$