Transuranium Elements
The synthetic elements with atomic numbers greater than 92, beyond uranium in the periodic table.
Formula / equation
Z > 92
Unit
Dimensionless
In depth
All are radioactive and, except for trace plutonium and neptunium in uranium ores, all are man-made. They are produced by neutron capture in reactors or by bombarding heavy targets with accelerated ions, and half-lives generally shorten as atomic number rises.
Examples in the real world
Neptunium, plutonium, americium in smoke detectors, and oganesson at element 118.