Packet 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. (-5[1])A centrifuge named for Gernot Zippe is used to aid in one (15[1])method of purifying (15[2])this element, (15[1]-5[1])which replaced a (15[1])gaseous diffusion (15[1])method. (15[4])This is the [emphasize] heavier element in a dating method where zircon (15[1])is utilized (-5[1])to (-5[1])estimate the age of (15[1])(*) igneous (10[1]-5[1])rocks. (-5[1])Martin Klaproth discovered this element when he isolated it (10[1])from yellowcake. (10[6])This element’s (10[4])235 (10[3])isotope (10[1])is (10[1])the starting (10[3])point for most (10[1])nuclear (10[2])reactors. (10[1])For 10 points, name this radioactive element with symbol U. (10[1])■END■ (10[2])

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