atom - the smallest particle of an element, made of protons, neutrons, and electrons, Bohr model of the atom - a model that explains why electrons in orbit do not spiral in to the centre of an atom, electron - subatomic particle surrounding the nucleus of an atom. It has a relative charge of -1, and a very small mass, electron shells - the orbits around an atom that are allowed for electrons in the Bohr model, neutron - subatomic particle found in the nucleus of an atom. It has no charge and a relative mass of 1, nucleus - the small centre of an atom made of protons and neutrons, plum-pudding model of the atom - outdated model of the atom in which electrons are embedded in a sphere of positive charge, proton - subatomic particle found in the nucleus of an atom. It has a relative charge of +1 and a relative mass of 1, Rutherford model of the atom - A model with a positively charged nucleus and electrons in orbit around it,

P1.1 The Particle Model

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