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  2. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_molecular_geometry

    In a tetrahedral molecular geometry, a central atom is located at the center with four substituents that are located at the corners of a tetrahedron.The bond angles are arccos(− ⁠ 1 / 3 ⁠) = 109.4712206...° ≈ 109.5° when all four substituents are the same, as in methane (CH 4) [1] [2] as well as its heavier analogues.

  3. Coordination geometry - Wikipedia

    en.wikipedia.org/wiki/Coordination_geometry

    IUCr have proposed a symbol which is shown as a superscript in square brackets in the chemical formula. For example, CaF 2 would be Ca [8cb] F 2 [4t], where [8cb] means cubic coordination and [4t] means tetrahedral. The equivalent symbols in IUPAC are CU−8 and T−4 respectively. [1]

  4. Tetrahedrane - Wikipedia

    en.wikipedia.org/wiki/Tetrahedrane

    In 1978, Günther Maier prepared tetra-tert-butyl-tetrahedrane. [1]The bulky tert-butyl (t-Bu) substituents envelop the tetrahedrane core.Maier suggested that bonds in the core are prevented from breaking because this would force the substituents closer together (corset effect) resulting in Van der Waals strain.

  5. Composition of the human body - Wikipedia

    en.wikipedia.org/wiki/Composition_of_the_human_body

    Pie charts of typical human body composition by percent of mass, and by percent of atomic composition (atomic percent) Body composition may be analyzed in various ways. This can be done in terms of the chemical elements present, or by molecular structure e.g., water , protein , fats (or lipids ), hydroxyapatite (in bones), carbohydrates (such ...

  6. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    There exist tetrahedra having integer-valued edge lengths, face areas and volume. These are called Heronian tetrahedra. One example has one edge of 896, the opposite edge of 990 and the other four edges of 1073; two faces are isosceles triangles with areas of 436 800 and the other two are isosceles with areas of 47 120, while the volume is 124 ...

  7. Polytope compound - Wikipedia

    en.wikipedia.org/wiki/Polytope_compound

    A regular polyhedral compound can be defined as a compound which, like a regular polyhedron, is vertex-transitive, edge-transitive, and face-transitive.Unlike the case of polyhedra, this is not equivalent to the symmetry group acting transitively on its flags; the compound of two tetrahedra is the only regular compound with that property.

  8. Examples of tetrahedral structures - Wikipedia

    en.wikipedia.org/?title=Examples_of_tetrahedral...

    Pages for logged out editors learn more. Contributions; Talk; Examples of tetrahedral structures

  9. Compound of two tetrahedra - Wikipedia

    en.wikipedia.org/wiki/Compound_of_two_tetrahedra

    If two regular tetrahedra are given the same orientation on the 3-fold axis, a different compound is made, with D 3h, [3,2] symmetry, order 12. Other orientations can be chosen as 2 tetrahedra within the compound of five tetrahedra and compound of ten tetrahedra the latter of which can be seen as a hexagrammic pyramid: