substance made of atoms of different elements bonded together in a certain ratio.

atom that has gained or lost one or more electrons.

forms between a positive and negative changed ion.

forms when atoms share a pair of electrons.

2 of more atoms held together by covalent bonds.

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Term	Definition
atom	smallest basic unit of matter.
element	one particular type of atom.
compound	substance made of atoms of different elements bonded together in a certain ratio.
ion	atom that has gained or lost one or more electrons.
ionic bond	forms between a positive and negative changed ion.
covalent bond	forms when atoms share a pair of electrons.
molecule	2 of more atoms held together by covalent bonds.