Minimum one atom of uranium 235.
Nuclear fission of uranium-235 release an immense amount of energy.Uranium is used as fuel in nuclear reactors.
The nuclear fission of uranium-235 release a huge amount of energy.This energy can be used in nuclear reactors to produce electricity/heat or in nuclear weapons.
We can use plutonium in nuclear fission devices.
The isotope uranium-235 (or uranium-233) under nuclear fission emit the energy of fission. This energy is transformed in heat and electricity.
Uranium
Uranium is used to make energy by fission
Uranium is used as nuclear fuel in nuclear power plants because the fission of uranium atom release a formidable quantity of energy.
Uranium
Nuclear power from the fission of uranium and/or plutonium
Usually uranium with various U-235 percentages.
Plutonium I think.
The energy of fission from uranium is transformed in electricity or heat in nuclear power plants.