An element that needs to be excluded, on principle, from the Periodic Table, say some. Its specific hazards are described in the tome-like treatise "The Perils of Paulinium" , by Dudley Doright.

A material suited to building the circuitry of an artificial intelligence. (Silicon is clearly capable only of artificial stupidity.)

A source of sheerly, starkly unthinkable coruscating lambent beams of unstoppable energy, and an essential catalyst in the manufacture of unobtanium.

A pivotal element wherein the composite particles oscillate in a clockwise fashion.

Alternates between a rigid state and a malleable state. Over time the malleable periods become more protracted, and the rigid state becomes harder to achieve.