Transuranium elements
Uranium is the last element occurring in nature. The elements coming after uranium are called transuranium elements. They are all synthetic in nature and are man made. They are radioactive and most of them have short half lives. For example :- 238 U 92 + 1 n 0 → 239 U 92 → 239 Np 93 + 0 e -1 Uranium → Neptunium 239 Np 93 → 239 Pu 94 + 0 e -1 Neptunium → Plutonium ( Here the Uranium(238,92) is abundant and non fissionable, It can be made into fissionable by reaction given above ) The element beyond actinides in the periodic table form atomic number 104 to 112 are called transactinide elements. These elements are rutherfordium (Rf), dubnium (Db), Seaborgium (Sg) etc. The nuclear reactions for the preparation of some of the transactinide elements are given below. 249 Cf 98 + 12 C 6 → 257 Rf 104 + 4 1 n 0 Californium → Rutherfordium 249 Cf 98 + 15 N 7 → 257 Db 104 + 4 1 n 0 Californium → Dubinium For more detail visit Indiastudychannel .com