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 (-5[1])named for Gernot Zippe is used to aid in one method of purifying this element, (15[2])which (15[1])replaced a gaseous diffusion method. This is the heavier element in a dating method where zircon is utilized to estimate the age of (*) igneous rocks. (-5[1])Martin Klaproth discovered this element when he isolated it from yellowcake. This element’s 235 (10[1])isotope is the starting point for most nuclear reactors. (10[1])For 10 points, name this radioactive element with symbol U. ■END■ (10[1])

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