Answer
$4.1\times10^{-15}m$
Work Step by Step
Mass number A= 18+22= 40.
Radius of the nucleus= $1.2\times10^{-15}m\times A^{\frac{1}{3}}$
Thus, we find:
= $1.2\times10^{-15}m\times 40^{\frac{1}{3}}= 4.1\times10^{-15}\,m$
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