In this lecture we're going to talk about group seven, a elements, also known as group 17, according to our newer system. Now, these guides are known as the halogens, and we're going to look at five halogens. Now, fluorine, chlorine, bromine and iodine are all very common, non metallic halogens. 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.