Answer:
[tex]radius=1.2x10^{-3}m[/tex]
Explanation:
Hello,
Based on the given information, the radius is computed via:
[tex]radius=1.2x10m*\frac{1}{10000}=1.2x10^{-3}m[/tex]
By assuming that the radius of the element is 1.2x10m, nevertheless, that is a pretty much big radius for an atom in meters, maybe a power is missing, but you can modify it by just including it in the aforesaid formula.
Best regards.