Valence Electrons and the Periodic Table

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This chemistry video tutorial provides a basic introduction into valence electrons and the periodic table. It explains how to determine the number of valence electrons and core electrons in an element by drawing the Bohr model of an atom, by writing the electron configuration of the element and by using the periodic table.

Protons & Neutrons - Free Formula Sheet:


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Speed of Light, Frequency, Wavelength:


Photon Energy:


The Photoelectric Effect:


De Broglie Wavelength:


The Bohr Model of Hydrogen:


Heisenberg's Uncertainty Principle:


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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:


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Orbital Diagrams:


Paired & Unpaired Electrons:


Aufbau's Principle & Hund's Rule:


Paramagnetic & Diamagnetic Elements:


Valence Electrons & Periodic Table:


Effective Nuclear Charge:


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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: