The thick talent, which is a metal lloyd, is the least common halogen, and that's called astonine with a symbol at. Now, we're not even really talk about this guy too much because he's not very common. But you should know that aside from these talents, there's also the thick talent called Astane. Now, halogens in general are very radioactive. And what that means is basically it reacts, or halogens react with even the most stable compounds causing damage. For example, halogens are deadly to humans or other organisms.