Neutrons: Facts about the influential subatomic particles

Neutrons are tiny subatomic particles that — along with protons — form the nucleus of an atom

While the number of protons defines what element an atom is, 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, respectively, alongside the proton.

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