Khan Academy Chemistry: Orbitals & Electron Configuration Full Timestamps & Chapters
[0:00] Review of Orbitals vs Orbits Recaps the difference between Bohr model orbits and quantum mechanical orbitals as probability density functions, using the 1s orbital as an example. [1:00] Visualizing Electron Probability Explains how multiple snapshots of electrons in the 1s orbital reveal higher probability near the nucleus, with 90% probability boundaries shown in diagrams. [2:30] Filling Orbitals from Lowest Energy Describes the principle of filling orbitals from lowest to highest energy, using the Tetris analogy and the 1s to 2s transition for lithium. [4:00] Introduction to p Orbitals Introduces p orbitals with their dumbbell shapes in x, y, and z directions, and explains how they fill after s orbitals. [5:30] Electron Configuration of Carbon Walks through the electron configuration of carbon (1s² 2s² 2p²) and visualizes the p orbital electrons in three dimensions. [7:00] Using the Periodic Table for Configurations Demonstrates how to use the periodic table to determine electron configurations, rearranging helium and identifying s and p blocks. [8:30] Configuration Examples: Nitrogen and Silicon Shows step-by-step electron configurations for nitrogen (1s² 2s² 2p³) and silicon (1s² 2s² 2p⁶ 3s² 3p²), verifying electron counts. [10:00] Preview of d Orbitals and Next Steps Teases the d-block elements and their more complex orbital shapes, explaining the balance between nuclear attraction and electron repulsion.
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