Bromine is always a liquid, while iodine can be a liquid or solid when at room temperature, depending on several factors. All seven are nonmetallic. Diatomic elements are not rare — on the contrary!

Fluorine and chlorine are gases. Bromine is one of only two liquid elements. Iodine is solid. They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group the ...

Fluorine and chlorine are gases. Bromine is one of only two liquid elements. Iodine is solid. They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group the ...