Hydrogen halide

The formula is HX where X is one of the halogens: fluorine, chlorine, bromine, iodine, astatine, or tennessine.

This trend is attributed to the increasing strength of intermolecular van der Waals forces, which correlates with numbers of electrons in the molecules.

This mist arises from the formation of tiny droplets of their concentrated aqueous solutions of the hydrohalic acid.

These acids are very strong, reflecting their tendency to ionize in aqueous solution yielding hydronium ions (H3O+).

Hydrofluoric acid is complicated because its strength depends on the concentration owing to the effects of homoconjugation.

Comparison of the boiling points of hydrogen halides and hydrogen chalcogenides ; here it can be seen that hydrogen fluoride breaks trends alongside water .