Question
The best single-molecule magnets are made from these paramagnetic elements. For 10 points each:
[10e] Name these elements that make up the top row of the f block on the periodic table, above the actinides.
ANSWER: lanthanide group [or lanthanides; prompt on rare-earth elements or metals]
[10h] Exact term required. The lanthanide in a single-molecule magnet is bonded to bulky ligands to slow down this process. The timescale for free induction decay after a nucleus resonates in NMR is the rate of this process.
ANSWER: magnetic relaxation [or relaxing]
[10m] Molecular magnets are usually oriented in this asymmetrical VSEPR (“vesper”) molecular geometry. A central atom is bonded to four ligands and has a lone pair in this geometry, which is named for an object it ostensibly resembles.
ANSWER: seesaw [or sawhorse; or disphenoidal]
<Adam Silverman, Science - Chemistry> ~23170~ <Editor: Adam Silverman>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2024 PACE NSC | 06/08/2024 | Y | 36 | 15.28 | 100% | 42% | 11% |