A labeled diagram of an atom in which the protons are the green circles with the plus sign.
An example of a proton is the single proton in the nucleus of a hydrogen atom.
Origin of protonModern Latin from Classical Greek pr?ton, neuter of pr?tos, first: see proto-
Origin of protonFrom Greek prōton neuter of prōtos first ; see per1 in Indo-European roots.
From Ancient Greek Ï€Ïá¿¶Ï„Î¿Î½ (prÅton), neuter of Ï€Ïá¿¶Ï„Î¿Ï‚ (prÅtos, “first")