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Curated by: Khan Academy India - English (13 videos)
What makes certain first elements of each group unpredictable? In this video, we uncover the root causes of anomalous behaviour shown by second-period elements — their small atomic size, high charge-to-radius ratio, high electronegativity, and the absence of d-orbitals. Here, we demonstrate how these factors reshape periodic trends, leading to striking consequences: from prevalent covalent bonding to the formation of unique pπ–pπ multiple bonds. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/class-11-chemistry-india/xfbb6cb8fc2bd00c8:in-in-classification-of-elements?lang=en Timestamps: 0:00 – Introduction 0:55 – Why Li and Be behave differently from their group members 2:03 – What is the Diagonal Relationship? 3:05 – Two Must-Know Questions Every Student Should Ask! 3:51 – Why Are 2nd Period Elements So Weird? (The Root Causes) 7:37 – What Happens *Because* of the Diagonal Relationship? Real Examples! 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 Nitika Duggal