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. And if we inhale some of the halogen gas, we will suffocate and die, because halogens react in our body in a very detrimental way. Now let's look specifically at fluorine. Now, fluorine exists in at room temperature in a diatomic gas form, f two form.