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Line 1: − Two or more atoms linked together to make a substance with unique properties.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. + + + − 2000</ref>
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A molecule is a group of two or more atoms linked together to form one unit. They are linked together by chemical bonds. The four types of chemical bonds are covalent, ionic, hydrogen or van der Waals'.
==References==
==References==