Assertion: cerium | /r/HasAspect | variable electronic structure
Facets:
Source sentences:
text: Cerium has a variable electronic structure.
text: Cerium has a variable electronic structure: the energy of the inner 4f level is nearly the same as that of the 6s level, allowing variable occupancy of these two levels.
text: Cerium has a variable electronic structure, which means only small amounts of energy are required to change the relative occupancy of the electronic levels.