It is iron.
Thorium is a natural chemical element.
Any element; neptunium can form himself a critical mass.
A element that produces light!
There is no specific element in plaster that produces. The chemical reaction that results when plaster is mixed with water is what produces the heat.
it is the element Argon
hydrogen
Copper
Mt. Vesuvius produces felsic lava in a pyroclastic explosion.
Neon
in a nuclear reactorby using a particle acceleratorin a nuclear explosion
Einsteinium