uranium

(ū-rā′nē-ŭm)

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[Uranus (the planet) + -ium (1)]
SYMB: U A radioactive metallic element, the parent of radium and other radioelements, atomic weight, 238.029, atomic number 92. Uranium ore contains the isotopes ²³⁸U, ²³⁵U, and ²³⁴U.

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