The table below lists the ionic radii for the cations and anions in three ionic compounds. 
Each compound has a cubic structure like NaCl, CsCl, or ZnS. Use the ratio of cation radius to anion radius to predict the structure formed (that of NaCl, CsCl, or ZnS). Then estimate the density of each compound. For ZnS structures, the holes occupied lie along the body diagonals of the unit cell so that 1/4 (body diagonal) = r+ + r-.
Definitions:
Body Temperature
The measure of the body's ability to generate and get rid of heat, reflecting the balance between heat production and loss.
Fall Asleep
The transition from wakefulness to sleep, a natural and necessary state of rest for the body and mind.
Electroencephalograph Pattern
The recorded electrical activity of the brain as detected by electrodes; used in neurological diagnostics.
Waking state
The state of consciousness when one is awake and aware of one's surroundings.
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