Why do atoms combine? Why are only certain combinations possible? Why do molecules possess definite shapes? To answer such questions different theories and concepts have been put forward from time to time. In this fourth unit of class 11 chemistry, we can answer the above questions by learning Kössel-Lewis approach, Valence Shell Electron Pair Repulsion (VSEPR) Theory, Valence Bond (VB) Theory and Molecular Orbital (MO) Theory.
Curated by: Khan Academy India - English (42 videos)
In this video, we will explore how electrons fill molecular orbitals in various diatomic molecules. We will also discuss the "before and after nitrogen" rule, where the order of orbital filling changes due to s-p mixing and why this difference is crucial for understanding several molecular properties, all in a clear, easy-to-understand way! 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-chemical-bonding-and-molecular-structure?lang=en Timestamps: 00:00 Recalling MOT formation 01:14 MO filling of 2 (H2 molecule) and 6 electrons (Li2 molecule) 03:41 Predicting energy levels of p MO 05:31 MO filling of 16 electrons - O2 molecule 06:56 s-p mixing and energy level swap below 16 electrons 10:23 Properties that can be predicted by MO configuration 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 Aswin Vijayaraghavan