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, (-5[1])which replaced a gaseous diffusion method. This is the [emphasize] heavier element in a dating method where zircon (15[1])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 isotope is the starting (10[2])point for most nuclear reactors. (10[1])For 10 points, name this radioactive element with symbol U. ■END■

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