why vander waal radius has weak force of attraction
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the attractive van der Waals force. It appears when the distance between two atoms (or molecules) is short, but not too short (if the atoms’ space-filling models are just touching or are separated by a small gap, then that’s perfect). The force is created by temporary imbalances in each atom’s electron distribution caused by electron movement around the nucleus. The imbalances produce small temporary electrostatic fields and two atoms will naturally correlate their imbalances (fields) so that they attract one another. The attractive force is very weak.
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