Calcium Oxide Has a Face Centered Cubic Unit Cell of Oxide

question 50

Multiple Choice

Calcium oxide has a face centered cubic unit cell of oxide ions with the calcium in octahedral holes.If the radius of Ca²⁺ is 106 pm and the density of CaO is 3.34 g/cm³,what is the radius of the oxide ion? (100 cm = 1 $\times$ 10¹² pm)

• A) 160 pm
• B) 120 pm
• C) 106 pm
• D) 135 pm
• E) 269 pm

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Definitions:

REM Sleep

Rapid Eye Movement sleep, a sleep stage characterized by eye movements, increased brain activity, and vivid dreams.

Alpha Waves

The brain wave pattern associated with deep relaxation.

Delta Waves

Slow brain waves that are present in deep sleep and in brain activities associated with unconsciousness.

EEG

Electroencephalography, a noninvasive method to record electrical activity of the brain used in the diagnosis of neurological disorders, sleep disorders, and for research in neuroscience.