Uranium.

Uranium. Uranium was discovered in the 1700's in the coal mines of bohemia and Jachlovikna. Uranium's atomic number is 92, its Symbol is U and the atomic mass of uranium is 238.0289. Miners called it Pechblende meaning, Pechblende, from the German words pech, which means either pitch or bad luck, and blende, meaning mineral Uranium's first full analysis was done on 1789 by Martin Klaproth, a self-taught well educated german chemist. Klaproth, having extracted from pitchblende what he …

…scendant in the chain from uranium to lead, its daughter is the gas radon, and polonium is the last radioelement before lead. The discovery of Uranium changed the world as we knew it, from its physical and chemical properties we came about the X-ray, following down the line, chemists and scientists used Uranium to make weapons of mass destruction, (i.e the Atom bomb). -- Refrence's 1. Comptons Online Encyclopedia 2. Websters Dictionary 3. Merill, Physical Science book