nucleus - the centre of an atom, contains protons and neutrons, proton - positively charged with a mass of 1, neutron - no charge with a mass of 1, electron - no mass, negatively charged, orbits on energy shells, energy shell - the level an electron orbits the nucleus, atomic number - the proton number of an element, mass number - the proton plus the neutron number of an element, nanometer - the size atoms are measured in , isotope - atoms of the same element (same proton number) but with different numbers of neutrons (so will have a different mass number),

Synergy: Atomic structure key words

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