Does anyone know what uranium is???

The answer to your question is "Yes".  Great numbers of people ... chemists, physicists, and common folks alike ... know what Uranium is.=================================Uranium is one of the 92 elements that are found to occur in nature.In the Periodic Table of the Elements, it is Element #92 ...  Its atomscontain 92 protons in their nucleii.

the chemical element of atomic number 92, a dense grey radioactive metal used as a fuel in nuclear reactors.