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  2. Cation-anion radius ratio - Wikipedia

    en.wikipedia.org/wiki/Cation-anion_radius_ratio

    Critical Radius Ratio. This diagram is for octahedral interstices (coordination number six): 4 anions in the plane shown, 1 above the plane and 1 below. The stability limit is at r C /r A = 0.414. The radius ratio rule defines a critical radius ratio for different crystal structures, based on their coordination geometry. [1]

  3. Pauling's rules - Wikipedia

    en.wikipedia.org/wiki/Pauling's_rules

    If the cation is smaller, it will not be in contact with the anions which results in instability leading to a lower coordination number. Critical Radius Ratio. This diagram is for coordination number six: 4 anions in the plane shown, 1 above the plane and 1 below. The stability limit is at r C /r A = 0.414

  4. Coordination number - Wikipedia

    en.wikipedia.org/wiki/Coordination_number

    Often the surface coordination number is unknown or variable. [9] The surface coordination number is also dependent on the Miller indices of the surface. In a body-centered cubic (BCC) crystal, the bulk coordination number is 8, whereas, for the (100) surface, the surface coordination number is 4. [10]

  5. Ionic radius - Wikipedia

    en.wikipedia.org/wiki/Ionic_radius

    Nevertheless, ionic radius values are sufficiently transferable to allow periodic trends to be recognized. As with other types of atomic radius, ionic radii increase on descending a group. Ionic size (for the same ion) also increases with increasing coordination number, and an ion in a high-spin state will be larger than the same ion in a low ...

  6. Rubidium chloride - Wikipedia

    en.wikipedia.org/wiki/Rubidium_chloride

    Because a cube has eight vertices, both ions' coordination numbers equal eight. This is RbCl's highest possible coordination number. Therefore, according to the radius ratio rule, cations in this polymorph will reach their largest apparent radius because the anion-cation distances are greatest. [4]

  7. The Hardest Working Royal of 2024 Is... - AOL

    www.aol.com/lifestyle/hardest-working-royal-2024...

    Kate Middleton rounded out the list at number 10, managing 11 engagements this year. Despite an 88% decrease, her commitment remains evident as she balanced royal duties with health-focused downtime.

  8. Coordination geometry - Wikipedia

    en.wikipedia.org/wiki/Coordination_geometry

    The coordination geometry depends on the number, not the type, of ligands bonded to the metal centre as well as their locations. The number of atoms bonded is the coordination number. The geometrical pattern can be described as a polyhedron where the vertices of the polyhedron are the centres of the coordinating atoms in the ligands. [1]

  9. Could changes be coming to Medicare, Medicaid with Dr. Oz ...

    www.aol.com/could-changes-coming-medicare...

    With President-elect Donald Trump's recent announcement of former surgeon-turned-TV host Dr. Mehmet Oz to lead the Centers for Medicare and Medicaid Services (CMS), questions are swirling about ...