Question

which subatomic particle has the least mass?
○ electron
○ proton
○ neutron
○ the atom

Explanation:

To determine which subatomic particle has the least mass, we analyze the masses of the options:

• An electron has a very small mass (about \(9.109\times10^{-31}\) kg).
• A proton has a mass of about \(1.6726\times10^{-27}\) kg.
• A neutron has a mass of about \(1.6749\times10^{-27}\) kg, slightly more than a proton.
• An atom is composed of subatomic particles, so its mass is the sum of the masses of its components (protons, neutrons, electrons), making it much more massive than a single subatomic particle.

Among the subatomic particles (electron, proton, neutron), the electron has the least mass.

Answer:

A. electron