Thats ok, people think of swimming pools when you say chlorine, because of this kind of connection the tendency is to greatly under estimate just how dangerous the Halogens are. Chlorine is the best of a very bad bunch. The worst is fluorine, yes the stuff in toothpaste comes from it, and yet so does Hydrofluric acid, 2% strengh of which will eat through pyrex glass in minuets. 4 cm area of skin covered with 20% strengh hydrofluric acid is likely to kill you without very fast treatment, you wont get a massive burn or much pain for a while, just a little white patch on your skin. But it gets into your system and dissolves all the calcium in your body!
Normally treated with Calcium Gluconate, anyone working with Hydrofluric acid over 10% must have a tube of the Gluconate near to them at all times. Really nasty stuff, then you get fluorine itself, not many people have really seen it or worked with it, its so difficult to contain and exposure never ends well, look at some chem vids on fluorine. lastly Bromine a very very poisonous red liquid often in gas form at room temp, next to impossible to contain in anything but a sealed glass vial, will rust everything in 5 mins within a 20 radius if you undo a bottle of it.
Chlorine the harmless sounding often mishandled little green genie with a killer bite. thats how my Chem teacher describes it lol. Very interesting to work with the Halogens though, but you need good equipment