1. The text is primarily concerned with discussing
[A] a way to isolate electrons.
[B] the characteristics of a new kind of crystal.
[C] the structure of an ionic salt.
[D] commercial uses for electrides.
2. In the first paragraph, the author is primarily concerned with
[A] introducing a variant on the standard atomic theory.
[B] describing how chlorine atoms can become negatively charged.
[C] describing some early research at Michigan State University.
[D] providing background for the technical discussion to follow.
3. According to the text, the defining characteristic of an electride is which of the following?
[A] Its positive are of particularly low mass.
[B] Its ions possess identical electrical charges.
[C] It contains a framework of regularly stacked ions.
[D] Its negative ions consist solely of electrons.
4. It can be inferred from the text that anions behaving as "simple charged spheres" (line 2, paragraph 3) could be expected to
[A] readily lose electrons and become positively charged.
[B] move freely in and out of their cavities.
[C] respond to photons by liberating electrons.
[D] remain fixed relative to their cations.
5. With which of the following statements regarding electrides would the author most likely agree?
[A] They have proven themselves to be of great commercial value.
[B] Their future commercial value is promising but uncertain.
[C] They are interesting but of no practical value.
[D] They have commercial value mainly in solar energy applications.
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