LEARNING GOALS Students will learn about the different particles that make up an atom. Students will understand that the mass of an atom is determined by the number of protons and neutrons in that ...

Protons are tiny subatomic particles that, along with neutrons, form the nucleus of an atom. The heavier the atom, the more protons (and neutrons) it contains.

Protons may have more "charm" than we thought, new research suggests. A proton is one of the subatomic particles that make up the nucleus of an atom.