Ekahafnium

Name:
Ekahafnium
Detailed information:
One of the last-discovered transuranic elements; atomic number 104. It has two α-emitting isotopes (257 and 259) and possibly a third (258). The former, made by bombardment of californium-249 with carbon-12 nuclei, has a half-life of five seconds and decays into nobelium-253. The 259 isotope, made by merging a carbon-13 nucleus with californium-249, has a half-life of three sec and decays to nobelium-255.