Round 2: Tossup 10

In a violation of the 22-electron rule, this element is sandwiched between two cyclooctatetraene (-5[1])(“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 (15[1])this element, (15[1])which replaced a gaseous diffusion (15[1])method. (15[1])This is the [emphasize] heavier element in a dating method where zircon is utilized to estimate the age of (*) igneous rocks. Martin Klaproth discovered this element when he isolated it from yellowcake. (10[1])This element’s 235 (10[1])isotope is the starting (10[1])point for most (10[1])nuclear reactors. For 10 points, name this radioactive element with symbol U. ■END■

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