RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY
Uranium. Chemical symbol and values for the radioactive element uranium (U), an actinide metal. Uranium-238, used as a nuclear fuel, contributes to the Earth's internal heat. It has a half-life of 4.5 billion years. Its nucleus decays by spontaneous fission or emitting an alpha particle to form thorium-234. Shown here are this chemical element's atomic number (92) and its standard atomic weight (238.029).
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