<p><strong>Noun</strong></p><ul><li>A white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass.</li><li>The 235 isotope is used in atomic and hydrogen bombs and as a fuel in nuclear reactors.</li><li>Symbol: U</li><li>Atomic mass: 238.03</li><li>Atomic number: 92</li><li>Density: 19.07</li></ul>