Atom - The smallest particle of a chemical element. Everything is made of atoms., Proton - A particle in the nucleus with a positive (+1) charge and a relative mass of 1., Neutron - A particle in the nucleus with no charge (0) and a relative mass of 1., Electron - A particle that orbits the nucleus in shells. It has a negative (-1) charge and a very small mass., Nucleus - The dense, positively charged centre of an atom. It contains all the protons and neutrons., Atomic Number (Z) - The number of protons in an atom's nucleus. This number defines which element it is., Proton Number - Another name for the Atomic Number., Mass Number (A) - The total number of protons and neutrons in an atom's nucleus., Nucleon Number - Another name for the Mass Number (since protons and neutrons are in the nucleus)., Isotopes - Atoms of the same element that have the same number of protons but a different number of neutrons.,

iGCSE Physics Nucleus & Isotopes

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