Answer
The three subatomic particles that make up an atom are protons, neutrons, and electrons.
Protons have a relative charge of +1 and a relative mass of 1.
Neutrons have no charge and a relative mass of 1.
Electrons have a relative charge of -1 and a mass negligible as compared to protons and neutrons. These negatively charged particles have an actual mass of $9.109$ x $10^{31}$.
Work Step by Step
The three subatomic particles that make up an atom are protons, neutrons, and electrons.
Protons are located in the nucleus of an atom, have a relative charge of +1, and have a relative mass of 1. These positively charged particles have an actual charge of $1.602$ x $10^{-19}$ and an actual mass of $1.673$ x $10^{-27}$.
Neutrons have no charge and a relative mass of 1. These neutral particles have an actual mass of $1.675$ x $10^{-27}$.
Electrons have a relative charge of -1 and a mass negligible as compared to protons and neutrons. These negatively charged particles have an actual charge of $-1.602$ x $10^{-19}$ and an actual mass of $9.109$ x $10^{-31}$.
