Uranium-235, found in natural Uranium at a level of 0.72%Uranium-233, produced in breeder reactors from Thorium-232
No. Uranium can be found naturally.
Yes, uranium can be produced on a large scale.Now the world production of uranium is approx. 55 000 t/year.
Uranium is recovered by mining and chemical processing.
Helium-4 can be a product of fusion. Hydrogen-1 cannot be produced by fusion. The uranium isotopes were probably produced by fusion in some star, long ago, and possibly not as uranium, but as something that decayed into uranium. I suppose it would be possible to produce the uranium isotopes in a lab by fusion, but I cannot imagine anyone do so, unless it was to prove a point.
The most common isotope of uranium is uranium-238.
When uranium radiates alpha particles, it transforms into thorium. Thorium is a radioactive element that is produced as a result of the decay of uranium through alpha emission.
New atoms are not created. They cannot be created. They can merely change form such as Uranium decaying to lead.
Uranium and radium, and a number of others, are natural elements found in the ground, and they are radioactive.
The production of uranium in each year is extremely small compared with the production of coal, oil, methane; but the most important is the energy obtained per unity of mass.
The energy density of Uranium is 2,715,385 greater than an equal amount of coal
uranium