Ultritium

Ultritium was a volatile and unstable explosive element with an atomic number of 125.

Ultritium was discovered in a chemical laboratory in 2345 and nearly destroyed the facility it was in.

Properties
Ultritium's subatomic particles are unstable, they are charged and are called semi-antiparticles, since they temporarily crossover to their opposite charge.

That is what causes Ultritium to be so explosive and volatile.

Ultritium plasma is 2x more reactive and volatile than natural, gelatinous Ultritium.