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2.one
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. |