He took a recording of Berlioz's Symphonie Fantastique to play in the empty orbital
capsule while waiting for his crewmates to return from the lunar surface.
The bulky mesityl groups serve to protect this empty orbital
from attack by external nucleophiles giving rise to air-stable materials which exhibit strong intramolecular charge transfer transitions.
The O atoms in the anatase Ti[O.sub.2] have an oxidation state of -2, which implies that O accepts two electrons in its 2p empty orbitals
. Carbon has 2 electrons less than O, so its 2p orbitals are not going to be full by receiving 2 electrons like O atoms.