$SrO$ has a $NaCl$ structure. If the lattice constant $a = 0.514 \ nm$ and the ionic radius of $Sr^{2+} = 0.113 \ nm$,what is the radius of the $O^{2-}$ ion?
- A$1.44 \times 10^{-10} \ m$
- B$1.44 \times 10^{-8} \ m$
- C$1.44 \times 10^{-9} \ m$
- D$1.44 \times 10^{-12} \ m$
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