Question

which component of the atom has the least mass

Answer 1

If by "biggest" and "smallest", you mean mass (which is a measure of how much matter is there), then the smallest is the hydrogen atom with one proton and one electron.

Answer 2

Answer:

The correct answer is: Electron

Explanation:

Atom is the fundamental unit of matter that is composed of the subatomic particles electrons, protons and neutrons.

The nucleus of an atom contains protons and neutrons and are collectively known as the nucleons. Approximately 99.94% of the total mass of the atom is in the nucleus on the atom.

Therefore, the electrons has the least mass of about 9.11×10⁻³¹ kg which is approximately 1/1836 to the mass of the proton.