In ion-exchange chromatography, the trade-off between this quantity and reaction kinetics arises after this quantity exceeds three. Molecules for which this quantity varies based on a binding partner’s molecular size are denoted “flexi-.” Different values for this quantity determine whether molecules follow the delta vs. lambda or fac vs. mer configuration schemes. This quantity equals two for each of the three donors in octahedral molecules during the Bailar and Ray–Dutt twists. Unlike a similar quantity, this quantity does not consider whether bound atoms are contiguous with each other. This quantity, which must be at least two for a metal to be chelated, is equal to six for EDTA. For 10 points, name this quantity that is equal to the number of atoms a ligand can donate to a metal atom and that is often contrasted with hapticity. ■END■
| 2025 ACF Nationals | 04/19/2025 | Y | 24 | 92% | 0% | 67% | 122.45 |
| Player | Team | Opponent | Buzz Position | Value |
|---|---|---|---|---|
| Andrew Wang | Illinois A | UC Berkeley A | 51 | -5 |
| Tony Chen | Toronto A | Waterloo A | 55 | -5 |
| Adam Fine | Chicago A | WUSTL A | 55 | -5 |
| Bryan Ugaz | Arizona State | Ottawa | 57 | -5 |
| Amogh Kulkarni | Georgia State | British Columbia | 59 | -5 |
| Richard Niu | Cornell A | Georgia Tech | 61 | 10 |
| Anurag Sodhi | MIT | Chicago B | 61 | -5 |
| Caleb Ott | Waterloo B | NYU | 64 | -5 |
| Allan Lee | Stanford | North Carolina A | 70 | -5 |
| Geoffrey Wu | Columbia A | Northwestern | 84 | -5 |
| Jason Zhang | Toronto C | Texas | 87 | 10 |
| Teigue Kelly | Penn State | Florida | 87 | -5 |
| Joy An | Harvard | Johns Hopkins | 98 | -5 |
| Shiva Tegulla | UCF | Winona State | 101 | 10 |
| Alex Akridge | Indiana | Rutgers | 106 | 10 |
| Conor Thompson | Iowa State | Minnesota | 107 | 10 |
| Raymond Chen | Toronto B | Virginia Tech | 107 | 10 |
| Nikhil Chellam | Northwestern | Columbia A | 107 | 10 |
| Joseph Chambers | Virginia | Illinois B | 110 | -5 |
| Calvin Bostleman | Ohio State | Vanderbilt | 110 | 10 |
| June Yin | WUSTL B | Yale | 110 | -5 |
| Derek Chen | Columbia B | RIT | 113 | -5 |
| Yashwanth Bajji | Michigan | Cornell B | 113 | -5 |
| Albert Yingzhi Nyang | LSE | UC Berkeley B | 129 | -5 |
| Tiffany Zhou | Florida | Penn State | 129 | 10 |
| Isaac Mammel | Maryland | North Carolina B | 135 | 10 |
| Shardul Parthasarathy | Illinois B | Virginia | 137 | 10 |
| Maximilian Niebur | Johns Hopkins | Harvard | 137 | 10 |
| Rasheeq Azad | North Carolina A | Stanford | 137 | 10 |
| Liam Kusalik | Waterloo A | Toronto A | 137 | 10 |
| Anuttam Ramji | UC Berkeley B | LSE | 137 | 10 |
| Cade Reinberger | RIT | Columbia B | 137 | 10 |
| Rohan Shelke | UC Berkeley A | Illinois A | 137 | 10 |
| Neal Joshi | WUSTL A | Chicago A | 137 | 10 |
| Alan Xie | Yale | WUSTL B | 137 | 10 |
| Ryan Rosenberg | NYU | Waterloo B | 137 | 10 |
| Colin Veevers | Ottawa | Arizona State | 137 | 10 |
| Russell Nip | British Columbia | Georgia State | 137 | 10 |
| Ezra Santos | Chicago B | MIT | 137 | 0 |