Question

what is the limit to measure atomic radius

Answer 1

Under most definitions the radii of isolated neutral atoms range between 30 and 300 pm (trillionths of a meter), or between 0.3 and 3 ångströms. Therefore, the radius of an atom is more than 10,000 times the radius of its nucleus (1–10 fm), and less than 1/1000 of the wavelength of visible light (400–700 nm).

Answer 2

30 to 300 p.m or . 0.3 to 3 angstroms