Neutron - GCSE Chemistry Definition
Reviewed by: Richard Boole
Last updated
A neutron is a subatomic particle found in the nucleus of an atom, alongside protons. Neutrons have no electrical charge (they are neutral), unlike protons, which are positively charged. Neutrons and protons together make up most of an atom’s mass.
Neutrons help stabilise the nucleus by reducing the repulsion between the positively charged protons. Atoms of the same element can have different numbers of neutrons, forming isotopes. Understanding neutrons is important in GCSE Chemistry for topics like atomic structure, isotopes, and nuclear reactions.
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