The difference between chemical and nuclear reactions is nuclear reactions change the nucleus, chemical reactions rearrange electrons, not nuclei nuclear reactions only occur in atoms with a mass greater than 200 amu chemical reactions do not need to conserve charge and mass nuclear reactions involve a rearrangement of atoms, chemical reactions involve changing atoms

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Q: -S NaCN H₂0

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.