Question

What is the most important subatomic particle in an atom?

Answer 1

Answer:

Proton and electron is the most important subatomic particle in an atom.

Answer 2

Answer:

I would say proton and electron are the two most important subatomic particles in an atom. The number of protons inside a nucleus must equal to the number of electrons outside of the nucleus. This number determines all the chemical properties of the atom, which governs the behaviors of all matters in our world.