London dispersion forces would be the only intermolecular force holding two methane molecules together.
The least powerful intermolecular force is the London dispersion force. When the electrons in two nearby atoms occupy positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive force. The term "induced dipole-induced dipole attraction" is frequently used to describe this effect.
Argon, hydrogen gas, fluorine gas, and methane are non-polar particles that solely have London dispersion forces between their atoms or molecules.
When molecules and/or ions are sufficiently close to one another, it is presumed that these dispersion forces exist between all of them. It is believed that ions and dipoles produce stronger, farther-reaching electrical forces that work in addition to those already mentioned.
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