Question

The radius of the nucleus of an atom is approximately equal to _______

Answer 1

Atomic nucleus:

• An atom is composed of three sub-atomic particles that are electrons, protons, and neutrons.
• The protons and neutrons reside inside the nucleus while the electrons revolve around it in circular orbits.
• An atomic nucleus is much, much smaller than an atom.
• The protons and neutrons in the nucleus are held together by strong nuclear forces and overcome the repulsions between protons.
• The diameter of an atom is about ${10}^{-10}\mathrm{m}$, whereas the diameter of the nucleus is roughly ${10}^{-15}\mathrm{m}$ which is about $100,000$ times smaller.

Hence, the radius of the nucleus of an atom is approximately equal to ${10}^{-15}\mathrm{m}$.