Atomic models and periodicity
10 videos
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Chemistry - Atomic Models and Periodicity Overview
Learn how electron arrangement in atoms creates firework colors and explains the periodic table's structure and trends in chemistry.
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Chemistry - Atomic Spectra and Energy Levels
Learn how scientists identify star composition using spectral lines. Electrons jump between energy levels, emitting unique light patterns that act as atomic fingerprints.
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Chemistry - Shells, Subshells, and Orbitals
Learn how electrons are organized in atoms using shells, subshells, and orbitals—like finding an apartment by floor, hallway, and room number.
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Chemistry - Writing Electron Configurations
Learn how electrons fill atomic orbitals using the Aufbau principle and the periodic table. Includes examples and noble gas shorthand notation for electron configurations.
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Chemistry - Electron Configurations of Atoms and Ions
Learn how to write electron configurations for ions. Covers anions gaining electrons, cations losing from highest energy levels, and transition metal exceptions.
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Chemistry - Lewis Dot Diagrams for Atoms and Ions
Learn how to draw Lewis dot diagrams by representing valence electrons as dots around element symbols. Covers the method for atoms and ions with practical examples.
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Chemistry - The Periodic Table: Groups, Periods, and Key Families
Learn how the periodic table organizes elements by periods and groups, revealing patterns in electron shells, chemical properties, and element families like metals and nonmetals.
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Chemistry - Atomic Radii Trends on the Periodic Table
Explains periodic trends in atomic radius: atoms get larger down groups (more shells) and smaller across periods (more protons). Covers shielding and nuclear charge effects.
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Chemistry - Ionization Energy Trends on the Periodic Table
Learn how ionization energy changes across periods and down groups on the periodic table, and why atomic size and nuclear charge affect how tightly atoms hold electrons.
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Chemistry - Solving Periodic Trends Problems
Learn periodic trends: atomic radius decreases across periods and increases down groups, while ionization energy does the opposite. Includes practice problems and tips.