Thursday, October 29, 2009

Transuranic Elements

Any element lying beyond uranium in the periodic table, i.e. any element of atomic number greater than 92. Except for the plutonium isotopes Pu-244 (half-life about 80 million years) and Pu-239 (continuous reformation in rock containing uranium by neutron capture in U-238 by neutrons from the spontaneous fission of U-238) detected in very small quantities, all transuranic elements must be produced artificially by suitable nuclear reactions. All are radioactive.


Table of transuranic elements
element namesymbolatomic no.
neptuniumNp93
plutoniumPu94
americiumAm95
curiumCm96
berkeliumBk97
californiumCf98
einsteiniumEs99
fermiumFm100
mendeleviumMd101
nobeliumNo102
lawrenciumLw103
rutherfordiumRf104
dubniumDb105
seaborgiumSb106
bohriumBh107
hassiumHs108
meitneriumMt109
darmstadtiumDs110
roentgeniumRg111
not yet named-112
not yet named-114
not yet named-115

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