Question

Previous bonus - Next bonus
This molecule composed of excited atoms was the first observed Rydberg molecule. For 10 points each:
[10h] Name this molecule, whose fully filled sigma-1s and sigma-star-1s molecular orbitals with no other MOs give it a bond order of zero. This molecule’s bond length of 5200 picometers makes it the largest diatomic molecule.
ANSWER: dihelium [or helium dimer; or He2; reject “helium”]
[10e] Despite having zero bond order in MO theory, dihelium is held together very weakly by these intermolecular forces named for a Dutch physicist. London dispersion and dipole-dipole interactions contribute to these forces.
ANSWER: van der Waals forces
[10m] Dihelium molecules have been observed to fit inside these other compounds in a host-guest relationship. These allotropes are denoted with the formula C-sub-x, where x is the number of atoms within the compound.
ANSWER: fullerenes [accept buckminsterfullerenes or buckyballs]
<Chemistry>

Back to bonuses

Summary

Data

Indiana BWashU D010010
Purdue AMiami0101020
WashU BNorthwestern A0101020
UChicago CNotre Dame0101020
Indiana APurdue C010010
Purdue DUChicago B010010
UIUC ASIUE A010010
UIUC CUChicago D010010
UChicago AWashU C0101020