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Mathematics 15 Online
OpenStudy (anonymous):

I beg you to help!! In a cubic unit cell of an ionic oxide A is a 2+ cation (cube corners), O is the oxide ion (cube faces) and X is a cation (cube centre). How many of the "X" ions are in the unit cell? Answer a. 1 b. 2 c. 8 d. 6 e. 4

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