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The noble gases have weak interatomic force, and consequently have very low melting and boiling points. They are all monatomic gases under standard conditions, including the elements with larger atomic masses than many normally solid elements.
Similarly, the melting points of solids increase with an increase in the strengths of the intermolecular forces. Three types of intermolecular attractive forces are known to exist between neutral molecules: dipole-dipole forces, London dispersion forces, and hydrogen-bonding forces. These forces are also called van der Waals forces after Johannes van der Waals, who developed the equation for predicting the deviation of gases from ideal behavior.