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, which replaced a gaseous diffusion method. 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. This element’s 235 isotope is the starting point for most nuclear 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
Buzzes
| Player | Team | Opponent | Buzzpoint | Value |
|---|---|---|---|---|
| Aadi Pudasaini | Lexington A | Belmont B | 29 | 15 |
| Willow Bhargava | Waltham A | Waltham B | 73 | 10 |
| Simon Zhang | Lexington B | Belmont A | 74 | 10 |
| Soham Gohil | Mansfield A | Mansfield B | 82 | 10 |
Summary
| Tournament | Edition | Match | Heard | Conv. % | Power % | Neg % | Avg. Buzz |
|---|---|---|---|---|---|---|---|
| VAULT II at Georgia Tech | 2026-01-24 | ✕ | 6 | 100% | 50% | 33% | 59.00 |
| Triangle Cup | 2026-03-13 | ✓ | 3 | 100% | 33% | 33% | 65.67 |
| VAULT II at Eden Prairie HS | 2026-03-13 | ✓ | 3 | 100% | 33% | 0% | 68.00 |
| VAULT II at McGill | 2026-03-13 | ✓ | 4 | 100% | 0% | 0% | 74.00 |
| VAULT II at UCSB | 2026-03-13 | ✓ | 5 | 100% | 60% | 20% | 51.60 |
| VAULT II Northern UK | 2026-04-24 | ✓ | 3 | 100% | 33% | 0% | 60.67 |
| VAULT II Southern UK | 2026-04-24 | ✓ | 4 | 100% | 25% | 50% | 72.50 |
| VAULT II at Harvard | 2026-04-30 | ✓ | 4 | 100% | 25% | 0% | 64.50 |
| VAULT II at MINT | 2026-06-19 | ✓ | 5 | 100% | 0% | 40% | 80.00 |
| VAULT II Stanford Online | 2026-07-17 | ✓ | 8 | 100% | 50% | 13% | 56.13 |