Electron Configurations

Outlining what electron configurations are in terms of shells and subshells, how to determine the electron configuration of an element and the use of shorthand notation to help when writing electron configurations. The filling order of orbitals and their relative energies are covered and examples for period 3 elements given, including the filling of 4s subshells before 3d subshells. For AQA, OCR (A), Edexcel and CIE A-level and IB Chemistry. Recap: 00:29 Order Electrons Fill Subshells (Aufbau Principle): 03:37 Example - Sodium and Aluminium Energy Level Diagrams: 05:07 Electron-Electron Repulsion in Orbitals (Hunds Third Rule): 06:05 Example - Carbon and Oxygen Energy Level Diagrams: 06:58 What are Electron Configurations?: 08:23 Example - Sodium Electron Configuration: 09:00 4s and 3d subshells: 11:38 Noble Gas Electron Configurations: 12:32 Electron Configurations of Ions: 14:09 Summary: 15:18 Examples used in the video: Sodium and Aluminium Energy Level Diagrams: 05:07 Carbon and Oxygen Energy Level Diagrams: 06:58 Sodium Electron Configuration: 09:00 Vanadium Electron Configuration: 12:11 Chloride and Sodium Ion Electron Configurations: 14:23 Relevant Videos: Atomic Structure https://youtu.be/fPOo9eEb_uk Electron Orbitals First Ionisation Energies Pages on chemistrystudent.com: https://www.chemistrystudent.com/atomicstructure.html https://www.chemistrystudent.com/electronorbitals.html https://www.chemistrystudent.com/electronconfigurations.html Thank you for watching - if you found the video useful, please like and subscribe!