Final answer:
In chemistry, the 'F center' refers to an electron vacancy in a crystal lattice and is not directly related to excess valence electrons in molecular structures. The F center is common in ionic crystals, while additional non-bonding electrons in molecules like IF5 and XeF4 are represented as lone pairs.
Step-by-step explanation:
The term 'The F center or "electron trap" is created within molecules of' refers to a concept in solid-state physics rather than molecular chemistry. Traditionally, 'F-center' refers to an anionic vacancy in a crystalline lattice that captures an electron, to maintain charge neutrality. This is common in ionic crystals, such as sodium chloride, where a chloride ion is missing and an electron resides in its place. This concept does not directly relate to molecular structures with leftover valence electrons.
Nevertheless, if we are discussing molecular chemistry, the closest related concept might be when we draw the Lewis structures of hypervalent molecules like IF5 and XeF4, we sometimes find that after assigning electrons to fill the valence shells of the outer atoms to eight, additional electrons may be assigned to the central atom. These additional, non-bonding electrons can be considered as lone pairs, but they are not "electron traps" in the same sense as an F center in a solid-state physics context.