Round 2: Tossup 10

In a violation of the 22-electron rule, this element is sandwiched between two cyclooctatetraene (“sigh-cloh-oct-ah-tet-rah-een”) rings in a metallocene. A centrifuge named for Gernot Zippe is used to aid in one method of purifying this element, which replaced a gaseous diffusion method. This is the [emphasize] heavier element in a dating method where zircon is utilized (-5[1])to estimate the age of (*) igneous (-5[1])rocks. Martin Klaproth discovered this element when he isolated it (10[1])from yellowcake. (10[1])This element’s (10[1])235 isotope is the starting point for most nuclear reactors. For 10 points, name this radioactive element with symbol U. (10[1])■END■ (10[1])

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