## Chemistry: The Central Science (13th Edition)

The predicted $As-Cl$ bond length is $2.24 \dot{A}$.
If the $As-As$ bond length is 2.48 then the atomic radii of $As$ is half that, or $1.24$. If the $Cl-Cl$ bond length is 1.99 then the atomic radii of $As$ is half that, or 0.995. Since the given length is given to the hundredths, the computed radii should be rounded to the hundredth. $0.995\approx1.00$ The predicted $As-Cl$ bond length is the sum of their atomic radii. $1.24+1.00=2.24$