Element: A substance that cannot be broken down chemically into anything simpler
Atom: The smallest posssible particle of an element
Compound: A substance composed of two or more elements chemically bonded together
Molecule: An arrangement of atoms covalently bonded together
Covalent Bond: A shared pair of electrons holding atoms together in a molecule
Ion: A particle formed from an atom of group of atoms by loss of gain of electrons. Losing electrons forms a positive ion/gaining electrons forms a negative ion
Ionic Bond: Electrostatic attraction between oppositely charged ions
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