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What is a neutron?

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Quick answer

A neutron is an electrically neutral particle found in the nucleus of atoms, alongside protons. Neutrons add mass and help hold the nucleus together; changing their number creates isotopes of the same element. It's a neutral (no-charge) particle in the atom's nucleus.

Key things to understand

  1. It's a neutral (no-charge) particle in the atom's nucleus.
  2. It has nearly the same mass as a proton.
  3. It helps bind the nucleus together.
  4. Changing the neutron count makes different isotopes.
  5. Free neutrons can trigger nuclear fission.

People also ask

What is a neutron's role in the atom?
It adds mass and helps hold the nucleus together; varying the number of neutrons creates isotopes of an element.
How do neutrons create isotopes?
Atoms of the same element always have the same protons but can have different neutron counts — those variants are isotopes.
Why are neutrons used in nuclear power?
A free neutron can split a heavy nucleus, releasing energy and more neutrons that sustain a chain reaction.
What is a neutron?
A chargeless particle in an atom's nucleus that adds mass and helps hold the nucleus together.
What's the difference between a neutron and a proton?
Protons carry positive charge; neutrons have no charge, though both sit in the nucleus.
What are isotopes?
Atoms of the same element with different numbers of neutrons.