24. According to the passage, the defining characteristic of an electride is which of the following?
Its positive ions are of particularly low mass.
Its ions possess identical electrical charges.
It contains a framework of regularly stacked ions.
Its ions demonstrate strong mutual attraction.
Its negative ions consist solely of electrons.
25. It can be inferred from the passage that anions behaving as simple charged spheres could be expected to
readily lose electrons and become positively charged
move freely in and out of their cavities
respond to photons by liberating electrons
stack with other anions to create a regular framework
remain fixed relative to their cations
26. It can be inferred from the passage that an electride behaves most like a normal ionic crystal when the electride has which of the following features?
The anionic cavities are widely separated.
All of the trapped electrons are able to delocalize.
The trapped electrons are liberated by impinging photons.
The ions are tightly packed together.
Most of the cations have lost their electrical charge.
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