Would you expect hydrogen chloride to be a gas, a liquid or a solid at room temperature and under pressure

I would expect it to be a gas, because both hydrogen and chlorine are gases at room temperature. The actual answer is a gas, you can read up on it here: https://global.britannica.com/science/hydrogen-chloride. Hope it helps.

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.

Ithink is a because if say increased in electronegativity