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

ANSWER: uranium [accept U before mentioned]
<Science - Chemistry, Rohan Ganeshan> | VAULT II Packet 02
= Average correct buzzpoint

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Buzzes

PlayerTeamOpponentBuzzpointValue
Pratyush JaishankerPrat PackMidnight Bus to Vista17-5
Andrew NucciDon't Ever Take Sides Against the FamilyWith Less Than 2 Years of Combined Quizbowl Experience3715
Nathan SilvermanwhateverAlways Set the Kurve4015
Ayush PatelLeif Eriksen's Striking AppearanceBasileus II: Electric Boogaloo4015
Jonas LarsonMidnight Bus to VistaPrat Pack5910
Skanda VasishtaBig Brown BallersHeauton Timorumenos8210

Summary

TournamentEditionMatchHeardConv. %Power %Neg %Avg. Buzz
VAULT II at Georgia Tech2026-01-24✕6100%50%33%59.00
Triangle Cup2026-03-13✓3100%33%33%65.67
VAULT II at Eden Prairie HS2026-03-13✓3100%33%0%68.00
VAULT II at McGill2026-03-13✓4100%0%0%74.00
VAULT II at UCSB2026-03-13✓5100%60%20%51.60
VAULT II Northern UK2026-04-24✓3100%33%0%60.67
VAULT II Southern UK2026-04-24✓4100%25%50%72.50
VAULT II at Harvard2026-04-30✓4100%25%0%64.50
VAULT II at MINT2026-06-19✓5100%0%40%80.00
VAULT II Stanford Online2026-07-17✓8100%50%13%56.13