Question

# Atomic radius is measured by:A.Rutherfords ${{\alpha }}$- ray scattering experimentB.X-ray diffraction techniqueC.Millikan’s oil drop methodD.Thomson's water-melon model

Hint: The atomic radii’s values, which is approximately ${\text{2 - 3}}{{\text{A}}^{\text{o}}}$, and is in the range of an X-rays wavelength.