How Many Calcium and Fluorine Ions Are There in the Fluorite

question 163

Multiple Choice

How many calcium and fluorine ions are there in the fluorite unit cell shown below?

• A) 4 Ca 2+ and 2 F -2
• B) 4 Ca 2+ and 8 F -
• C) 2 Ca 2+ and 4 F -
• D) 2 Ca 2+ and 8 F -
• E) 4 Ca 2+ and 4 F -

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Definitions:

Extracellular

Pertaining to being outside the cell membrane.

Plasma Membrane

A biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.

Permeable

A characteristic of materials that are able to allow liquids or gases to pass through them, especially through pores or interstices.

Gray Matter

The darker-colored area of the central nervous system; abundant in nerve cell bodies, dendrites, and axon terminals, associated with processing and cognition.