Atoms within hydrogen halides are bound by covalent bonds, forming polar molecules.
One of the halogens, it may cause skin irritation.
Colourless, odourless, lighter-than-air gas. The most common chemical element in the universe.
A colourless gas with a pungent odour, its solution in water is called hydrochloric acid.
One of the hydrogen halides, a highly aggressive substance - it even attacks glass.
A colourless, heavier-than-air gas with a pungent odour.