Graphic illustration of an atomic model with a nucleus containing protons and neutrons and electrons

Neutrons: facts about influential subatomic particles

Neutrons are tiny subatomic particles which, together with protons, form the nucleus of a atom.

While the number of protons defines the element of an atom, the number of neutrons in the nucleus can vary, resulting in different isotopes of an element. For example, ordinary hydrogen contains one proton and no neutrons, but the isotopes of hydrogen, deuterium, and tritium have one and two neutrons next to the proton, respectively.

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