Strontium (STNM)
*Has a silvery color, but turns to yellow when introduced to oxygen.
*Under pressure, it turns into Strontium powder (BSR), which ignites when introduced to oxygen (The flame should be red)
*When in water, strontium dissolves and creates hydrogen.
*When plutonium reacts, not only does it create URAN, but it creates Strontium 90 (SR90), a radioactive isotope of Strontium.
Fluorine (FLRN)
*A yellow gas.
*Reacts by igniting with water, gold, titanium, tungsten, hydrogen, oxygen, Liquid oxygen, liquid nitrogen, ice, plutonium, uranium, noble gas, strontium, and anything explosive or flammable.
*Attaracts electrons.
Those are my suggestion, hope you use them!
Support!! And grey, it's very useful.
greymatter:
Strontium powder could be really useful in bombs. Fluorine, yet again could be useful in bombs. It also could be used to clear up electrons.
As for the strontium-90, it can simply be STNM with a tmp of 90.
Strontium-90 is an isotope, not a temperature.