there is not uranium in the sun. the nuclear fusion is due to hydrogen that fuses to helium
The isotope 235U is important for the nuclear fissionreaction (not fusion !).
Try www.world-nuclear.org
Fission of usually Uranium
No. it is an example of nuclear fission (splitting of nucleus).
Uranium makes for an excellent element for nuclear fission. Hydrogen is most commonly used for nuclear fusion.
Uranium mainlyPlutonium and Uranium in fission weapons, Lithium deuteride in fusion weapons, occasionally small amounts of Tritium gas to boost fission weapons with fusion.
Some nuclear power reactors work with low enriched uranium; CANDU reactors work with natural uranium.
That is nuclear fission. An example is that of a Uranium-239 atom undergoing beta decay. That is, a neutron in the nucleus ejects and electron, becoming a proton, resulting in Uranium-239 becoming Neptunium-239.
Uranium has stored energy (potential energy), more specifically, nuclear energy.
Elements that have greater atomic masses then uranium are created using nuclear fission.
Uranium is fairly easy to obtain, and the 235 isotope can be separated or increased, which is the fissile one. The only alternative is plutonium, and that has to be separated out from used uranium fuel. In some countries, but not the US, this has been done and a mixed uranium/plutonium fuel produced.