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Atoms and isotopes

An atom is made from a nucleus surrounded by electrons. The nucleus contains protons and neutrons.
Isotopes are atoms that have the same number of protons, but different numbers of neutrons.
The nuclei of some isotopes are unstable. They emit radiation and break down to form smaller…

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Nuclear fission and fusion

Nuclear reactors use a type of reaction called nuclear fission, which involves splitting atoms.
Uranium or plutonium isotopes are normally used because their relatively large nuclei that are easy
to split, especially when hit by neutrons.
When the nucleus is hit by a neutron:
It splits…


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