Yes. In the ores of the earth.
in earth
Uranium is found in the earth only in the form of compounds. Uranium is present in cca. 200 minerals.
It is known that uranium 238 is found in meteorites and Plutonium 242 is found in very small amounts naturally in Uranium ores here on earth. So I would take a guess that in meteorites where uranium is found, tiny amounts of plutonium 242 will also be found.
Helium is found in the sun. It is also found in the Earth's atmosphere.
No, uranium is a natural chemical element.
Almost every element from hydrogen to uranium (going from smallest to biggest) is found naturally on Earth. Technitium is not found naturally on Earth, it is the exception. The trans-uranic elements are also not found naturally on Earth.
Uranium is mined and distilled from underground. 25% of uranium is found in Canada, the rest is in Australia, Kazakhstan, Niger, Russia, and Namibia. Uranium is found in ores, mostly uranium oxides.
This process is called stellar nucleosynthesis.
Uranium concentration in the earth crust: ca. 2,5 ppm (mg/kg) Uranium concentration in the sea water: ca. 3 ppb (micograms/kg)
Actinium exist in minute traces associated with uranium or thorium ores.
Yes; helium appear from radioactive disintegration of uranium or thorium.
I think uranium has the higgest number of electrons of all the naturally found elements. Uranium in its stable state have 92 protons and 92 electons but the thing that makes it radioactive is the number of neutrons (146). Purification of uranium from uranium oxide is really expensive.