This video lecture from Atomic Structure (F.Sc. First Year Chemistry) covers the definition of X-RAYS, their production, experimental details and the Contribution of Moseley. Moseley's Law which suggests that heavier the target metal, shorter is the wavelength, its importance and contribution in the periodic table are also included. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.