between: atoms in a molecule or molecules in a solid (more particularly between specified states of those atoms or molecules)
is: a quantum physical phenomenon associated with a specific bonding energy that causes the atoms or molecules that have bonded to act as a single entity. [P11.4]
is fundamentally explained: by electromagnetic forces between the atoms or molecules. [P11.4]
may be classified: according to the number of electrons involved in maintaining the bond.
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