Variation in atomic size | D and F block elements | Grade 12 | Chemistry | Khan Academy

In this video, we explore how atomic radius changes across a period and down a group in the periodic table. We also explain the anomalous variation in the d-block caused by the shielding effect, which results in d-block (or scandide) contraction. Additionally, we see why, in the d-block, the radius does not significantly increase down the group due to the influence of the f-block (lanthanide) contraction. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/c... Timestamps: 00:00 - Variation of atomic size across the period and group. 02:00 - Variation of atomic size across the 3d series. 04:30 - Nature of shielding. 05:30 - Variation of atomic size in p-block. 08:18 - D-block contraction. 08:52 - Lanthanide contraction. Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Khan Academy