The identity of the "discoverer" of this halogen element very much depends on the nationality of the textbook that one might consult By Eric Scerri Excerpted from A Tale of 7 Elements, by Eric Scerri.

They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group the halogens become less reactive. Noble gases. The elements in group 0 are known as noble gases.

They exist as diatomic molecules - they have two atoms in each molecule. As you go down the group the halogens become less reactive. Noble gases. The elements in group 0 are known as noble gases.