Your mystery gas could have been Bromine.mb16 said:this is what i can remember:
hydrochloric acid
a highly toxic gas made by adding a acid and something else (it was orange in colour)
mercury
radiative material (Uranium-238 i believe)
in chemistry we did the best test ever
someone mixed up the beakers so we combined hydrochloric acid with.... hydrochloric acid. and then wondered why nothing was happening
I've handled Cyanides before, mostly Sodium Cyanide.
The most deadly toxin on the planet is believed to be the BSE prion protein. A single molecule is enough to eventually kill you. To work with it you have to wear a space suit which is burned when you are done.