Round 4: Tossup 12

Idealized rotation in systems with this property were described in five cases by Friedrich Hund. The MOPAC software package developed by Michael Dewar’s group is based on a semi-empirical method that neglects differential overlap in systems with this property. The Wigner–Witmer correlation rules generate term symbols for molecules with this property. Fully-filled sigma-1s (“sigma-one-S”) and sigma-star-1s orbitals give a bond order of zero to the largest molecule with this property, (-5[1])which was the first observed Rydberg molecule. Excited noble gas compounds named for having this property act as a UV light source in LED (10[1])lamps. Molecules with this property have (-5[1])three translational and two rotational degrees (-5[1])of freedom, (10[2]-5[1])and (10[1])can be (10[1])modeled (10[1]-5[1])with the Morse (10[2])potential. (10[3])For 10 points, (10[1])name this property possessed by molecules like elemental nitrogen (10[1])and hydrogen. (10[1])■END■ (10[6]0[2])

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