A chemical element with atomic number 92. Uranium was discovered in 1789 by Martin Heinrich Klaproth though it was not until 1842 that it was successfully isolated by Eugéne-Melchior Péligot. The name uranium is derived from the planet Uranus.
The nuclides fed in the radioactive decay of 238U including all daughters through stable 206Pb. Also known as the (4n+2) series because each member of the series has a mass equivalent to (4n+2), where n is an integer.