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A molecule is the smallest unbreakable unit of a specific element or compound that retains the chemical properties of that element or compound. Molecules are composed of two or more atoms that are joined together by chemical bonds. An example of a molecule is H2O (water) which contains two hydrogen atoms and one oxygen atom.
A compound is a chemical substance that is formed by the combination of many identical molecules that contains atoms from more than one element which are held together by chemical bonds that are difficult to break. An example of a compound is NaCl, which is composed of sodium and chlorine.