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Gravity!
Dispersion forces (London dispersion forces) are generally the weakest type of intermolecular force. These forces are caused by temporary fluctuations in electron distribution around atoms or molecules, leading to weak attractions between them.
There are only four ways that substances interact, or if you prefer, four forces in the universe. They are gravity, the weak nuclear force, electro-magnetic, and the strong nuclear force. In molecules ( presumably in liquid or gaseous states ) they will be slightly pulled together by gravity, but it is the electro-magnetic force that governs everything else. Whether they bind together, break down into component atoms or simpler molecules, form new compunds, etc. is all part of the electro-magnetic interaction.
Solid matter typically has the maximum intermolecular forces compared to liquids and gases. This is because the particles in a solid are closely packed together, allowing for stronger attractions between them such as van der Waals forces, hydrogen bonding, and dipole-dipole interactions.
intermolecular force
This is an intermolecular force.
Boiling point is a property not a force; but a high boiling point indicate a strong intermolecular force.
Intermolecular attraction
The intermolecular force that exists between Na and water is primarily ionic bonding. When Na is placed in water, the water molecules surround the Na ions and form hydration shells due to the attraction between the positively charged Na ions and the negatively charged oxygen atoms in water molecules.
The intermolecular force in Ar (argon) is London dispersion forces, which are the weakest type of intermolecular force. This force is caused by temporary fluctuations in electron distribution around the atom, leading to temporary dipoles.
Intramolecular forces are not intermolecular forces !
The intermolecular force in BF3 is London dispersion forces. This is because BF3 is a nonpolar molecule, so the only intermolecular force it experiences is the temporary weak attraction between temporary dipoles.