Neutronium


 * Not to be confused with Neutrogen.

 is a greenish powder. No experiments can be conducted because it is very volatile.

Technically it is not an atom because it is comprised of a bunch of neutrons, held together because the atomic structure is a self interlocking structure, and the neutrons exert force when they are compressed in the structure.

This structure is very easy to break, so even releasing a weak gravitational wave at the structure can break it apart.

When the structure is broken, all the energy is released in an instant. The energy from one of these structures is enough to wipe out an entire galaxy in one huge explosion.

Despite all this, it is relatively stable, and does not emit radiation normally (except when it explodes).

Its half-life is 610.1 seconds.