What happens to the states of matter in the halogen group?
At normal temperatures, the halogen elements,
Both fluorine and chlorine are diatomic gases at room temperature and pressure. Bromine is a liquid (elemental liquids are rare; can you think of another one?) Iodine is a volatile solid. Astatine is a short-lived species, which is not normally handled. As we descend the Group, van der Waals interactions between molecules became greater (as the electron cloud becomes bigger and more polarizable); hence the transition gas to (a) liquid to solid..