https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:molecular-and-ionic-compound-structure-and-properties/x2eef969c74e0d802:intramolecular-force-and-potential-energy/v/lattice-energy 2022-09-07T08:21:01.673602243Z Lattice energy The energy required to separate the ions in a crystal lattice into individual gaseous ions is known as lattice energy. Lattice energy depends on the strength of interactions between cations and anions in the lattice, which we can estimate using Coulomb's law: Fₑ = (q₁q₂)/r². According to this equation, stronger interactions occur between ions with larger charges and smaller radii. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/ae09ccc7-fff6-46e3-8ae7-489e663cb358_1280_720_base.png Lattice energy The energy required to separate the ions in a crystal lattice into individual gaseous ions is known as lattice energy. Lattice energy depends on the strength of interactions between cations and anions in the lattice, which we can estimate using Coulomb's law: Fₑ = (q₁q₂)/r². According to this equation, stronger interactions occur between ions with larger charges and smaller radii. https://cdn.kastatic.org/ka-youtube-converted/paXRIINiYlQ.mp4/paXRIINiYlQ.mp4 490 Oxides, thermal decomposition, and stability of group 2 compounds https://www.khanacademy.org/science/chemistry/acids-and-bases-topic/copy-of-solubility-equilibria-mcat/v/common-polyatomic-ions 2021-02-15T02:44:57Z Common polyatomic ions Reviewing the common polyatomic ions, and explaining common suffixes and prefixes to help remember the formulas.  Jay video https://cdn.kastatic.org/googleusercontent/33vRsC7UGI-xHw8vLHVajCFPAUqsaY2J7OYNUUski1vkPTK2mXqNiHZQo8iri-3C2L9Azzs7jROQsC-5ZeCYR6I Common polyatomic ions Reviewing the common polyatomic ions, and explaining common suffixes and prefixes to help remember the formulas.  https://cdn.kastatic.org/ka-youtube-converted/DpnUrVXSLaQ.mp4/DpnUrVXSLaQ.mp4 348 Oxides, thermal decomposition, and stability of group 2 compounds https://www.khanacademy.org/science/grade-12-chemistry-snc-aligned/x7a43e770fc9e15cf:alkaline-earth-metals/x7a43e770fc9e15cf:oxides-thermal-decomposition-and-stability-of-group-2-compounds/e/chemical-properties-of-alkaline-earth-metals 2023-01-09T09:31:58.042683191Z Properties of compounds of group1 vs group2 metals We are now familiar with the characteristics of compounds of alkali metals and alkaline earth metals. Let's find out how well we understand the properties of these compounds by solving the questions in this exercise.  Revathi exercise https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:periodic-trends/v/atomic-and-ionic-radii 2021-01-04T18:35:18Z Atomic and ionic radii Atomic and ionic radii are found by measuring the distances between atoms and ions in chemical compounds. On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells). Similar trends are observed for ionic radius, although cations and anions need to be considered separately. Jay video https://cdn.kastatic.org/googleusercontent/OtLCosmSgkrprxD8aa4wAgHHnV9yR8ALfEAbwQdK7VHWSabodfCPHuwxsP86c4KCwvHfMzvUnzjEIaidEYOz31xo7Q Atomic and ionic radii Atomic and ionic radii are found by measuring the distances between atoms and ions in chemical compounds. On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells). Similar trends are observed for ionic radius, although cations and anions need to be considered separately. https://cdn.kastatic.org/ka-youtube-converted/rKoIcgBM4Vg.mp4/rKoIcgBM4Vg.mp4 686 Oxides, thermal decomposition, and stability of group 2 compounds