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Curated by: Khan Academy India - English (13 videos)
Why do some atoms eagerly accept an extra electron while others resist it? This video unpacks the concept of electron gain enthalpy in depth—clearly explaining what it means for an element to have a positive or negative electron gain enthalpy, and why this difference is chemically significant. We will explore how different factors affect electron gain enthalpy like atomic size, effective nuclear charge, screening effect and the effect of half-filled and fully-filled subshells. Along the way, we will also analyze how electron gain enthalpy generally changes across a period and down a group, and more importantly, examine the notable exceptions. 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: 00:00 – Introduction: What is Electron Gain Enthalpy? 01:15 – Positive vs. Negative Electron Gain Enthalpy 2:28 - Factors affecting Electron gain enthalpy 02:43 – Factor 1: Atomic Size 04:00 – Factor 2: Effective Nuclear Charge 05:23 – Factor 3: Screening Effect 06:50 – Factor 4: Half-filled and Fully-filled Subshells 07:55 – Trends Across a Period 09:55 – Trends Down a Group 11:32 – Major Exceptions (N, F, Be, Noble Gases) 12:06 – Successive electron gain enthalpies 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