How are London forces (Van Der Waals) formed?
This is the weakest intermolecular force. It is formed by the uneven distribution of electrons in a molecule which induces a dipole in the molecule (meaning a delta positive and delta negative charge forms across it). When this partially charged molecule comes into contact with another molecule, it induces a dipole in it. The two molecules are them attracted as negative attracts positive forming the London force.
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