Strontium

An explosive .turns into(really hot possibly red)fire when under pressure.turn into acid and hygn on contact with water.turns highly radioactive on contact with neutrons(prob just turn into isotope z).rusts iron as well.rapid conductor.melting point 777.

Example of use: a bomb with strontium,water and dmg will blow up shooting hygn, acid and fire the hygn will feed the fire even more.