This chemistry video tutorial explains how to determine the number of paired and unpaired electrons in an element. it also discusses paramagnetism, diamagnetism and ferromagnetism. Quantum Numbers - Free Formula Sheet: Chapter 7 - Video Lessons: Final Exam and Test Prep Videos: ______________________________ Speed of Light, Frequency, Wavelength: Photon Energy: The Photoelectric Effect: De Broglie Wavelength: The Bohr Model of Hydrogen: Heisenberg's Uncertainty Principle: ________________________________ Intro to Quantum Numbers: Orbitals & Atomic Energy Levels: Maximum Number of Electrons: Intro to Electron Configuration: Electron Configuration Exceptions: Noble Gas Notation: Electron Configuration of Ions: _______________________________ Orbital Diagrams: Paired & Unpaired Electrons: Aufbau's Principle & Hund's Rule: Paramagnetic & Diamagnetic Elements: Valence Electrons & Periodic Table: Effective Nuclear Charge: _________________________________ Slater's Rule: How To Identify The Element: Quantum Numbers - Mega Review: Quantum Numbers - Practice Test: Final Exams and Video Playlists: Full-Length Videos and Worksheets: