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Atom The smallest particle that exists as an element.
Proton A positively charged subatomic particle found in the nucleus of an atom.
Neutron A subatomic particle found in the nucleus of an atom. The neutron is electrically neutral, with a mass approximately equal to that of a proton.
Electron A negatively charged subatomic particle that has a negligible mass and is found outside the nucleus.
Ion An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Compound A substance formed by the chemical combination of two or more elements in definite proportions and usually having properties different from this of its constituent elements.
Molecule A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Ionic Bond The transfer of valence electrons between atoms.
Covalent Bond The sharing of electron pairs between atoms.
Isotope Varieties of the same element that have different mass numbers; their nuclei contain the same number of protons but different number of neutrons.
Radioactivity The spontaneous decay of certain unstable atomic nuclei.
Created by: probinson28