So I have an element collection which I take to school often for a teching opportunity about chemistry and I was wondering what might happen if we have a fire and I leave it there. Basically, name an element that isn't valuable or radioactive and I have it in there. Including gases. I keep all my heavy metals at home except a bit of mercury sealed in a glass tube which is in acetone which is in another glas vial. any ideas on which ones could be dangerous?