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atom the smallest particle of an element with all the properties of that element proton a positively charged particle located in the nucleus of an atom energy level region in which the electrons move isotopes atoms of the same element with a different amount of neutrons element substances that cannot be broken down by chemical means into a simpler substance neutron particle with no electrical charge located in the nucleus of the atom ionic bond Type of bond in which electrons are lost by one atom and gained by another compound two or more elements chemically combined in definite proportions electron negatively charged particle located outside the nucleus of an atom covalent bond type of bond in which electrons are shared by atoms