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What is the empirical formula of the ionic compound pictured here?

The pink particles represent boron ions and the purple particles represent arsenide ions.

Unit Cell (File:Boron-arsenide-unit-cell-1963-CM-3D-balls.png. Wikimedia Commons, 1 Dec. 2014. Web. 7 July 2016.)

A

$B_{2}As_{7}$

B

$B_{2}As$

C

$BAs_{2}$

D

$BAs$

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