Question

which element is the primary fuel used to generate electricity using nuclear energy? coal hydrogen uranium helium

Explanation:

Nuclear energy generation primarily relies on nuclear fission. Uranium - 235 is the isotope that undergoes fission in nuclear reactors. Coal is a fossil fuel used in thermal power plants. Hydrogen is not the primary fuel for current large - scale nuclear electricity generation. Helium is a noble gas and not used as a nuclear fuel for electricity generation in the way described.

Answer:

uranium