(At least, Pluto was the ninth planet until it was stripped of its status in 2006.) Between those planets sits Neptune, and the gap between the two elements leaves a space for their relatively unsung ...

A total of 25 transuranium elements have now been artificially synthesised, starting with neptunium element 93 and ending with the as yet unnamed element 118. This includes the most recently announced ...

Americium is gradually decaying to become another element 'called neptunium. 'Neptuniam atoms are much more stable. JON CHASE:'As more and more of the atoms become neptunium, 'the material becomes ...