On the periodic tables, there are 26 manmade elements that have atomic numbers from 93 to 118. These elements are called transuranic elements because their atomic numbers are higher than 92, which is the atomic number of uranium. Some of these manmade elements are neptunium, nobelium, fermium, lawrencium, curium and plutonium.
Transuranic elements are radioactive and can undergo nuclear fission. The main methods to create these elements are with a particle accelerator or a nuclear reactor. A particle accelerator is a device that raises a charged subatomic particle to higher energy states so that it can collide with another particle. Nuclear reactors are devices in which nuclear fission reactions take place. The process of nuclear fission involves the splitting of an atom's nucleus, which produces a massive amount of energy.