Sure, I want to add back all the elements I removed in the last update but I am not sure as of now if it's even possible anymore. I want to release a finished update someday.
That is the elements that i always wanted:
name: URNN
color: Metallic
abilities: can fission spontaneosly but not too explosive. heats up by fission. solid
melt: 5200 degrees celsius
heat conductivity: 100 percent
also can`t efficiently fission with fast neutrons. only fissions with slower ones