* Charge: Neutral (no charge).

* Mass: Approximately equal to the combined mass of one proton and one electron.

* Structure: Composed of three quarks (one up quark and two down quarks) held together by the strong nuclear force.

Proton and Electron together

* Charge: The charge of a proton and electron together is zero, as the positive charge of the proton cancels out the negative charge of the electron.

* Mass: The mass of a proton and electron together is approximately equal to the mass of a hydrogen atom.

* Structure: A hydrogen atom consists of a proton in the nucleus and an electron orbiting the nucleus. The proton is held in the nucleus by the strong nuclear force, while the electron is held in orbit by the electrostatic force between the positive and negative charges.