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What are key points about london forces
They are weak and easily broken
They are caused by random electron movement, every single atom or molecule will experience london forces.
Strength of london forces depends on electrons

How do london forces form (instantaneous dipole)
Because electrons always moving, they briefly become unevenly distributed, making one side of molecule slightly more negative than the other. this is called instantaneous dipole

How do london forces form (Induced dipole0
This temporary dipole ( instaneous dipole) pushes electrons in a neighbouring molecule away, causing the neighbouring molecule to become temporarily polar as well ( an induced dipole)

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