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  2. Tetrahedral molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_molecular_geometry

    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. Methane and other perfectly symmetrical tetrahedral molecules belong to point group T d, but most tetrahedral molecules have lower symmetry. Tetrahedral molecules ...

  3. List of character tables for chemically important 3D point groups

    en.wikipedia.org/wiki/List_of_character_tables...

    For each non-linear group, the tables give the most standard notation of the finite group isomorphic to the point group, followed by the order of the group (number of invariant symmetry operations). The finite group notation used is: Z n : cyclic group of order n , D n : dihedral group isomorphic to the symmetry group of an n –sided regular ...

  4. Molecular symmetry - Wikipedia

    en.wikipedia.org/wiki/Molecular_symmetry

    The symmetry group C 3v for NH 3 has the three symmetry species A 1, A 2 and E. The modes of vibration include the vibrational, rotational and translational modes. Total modes = 3A 1 + A 2 + 4E. This is a total of 12 modes because each E corresponds to 2 degenerate modes (at the same energy). Rotational modes = A 2 + E (3 modes) Translational ...

  5. Symmetry of diatomic molecules - Wikipedia

    en.wikipedia.org/wiki/Symmetry_of_diatomic_molecules

    Molecular symmetry in physics and chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry. Molecular symmetry is a fundamental concept in the application of Quantum Mechanics in physics and chemistry, for example it can be used to predict or explain many of a molecule's properties, such as its dipole moment and its allowed ...

  6. Symmetry number - Wikipedia

    en.wikipedia.org/wiki/Symmetry_number

    The symmetry number or symmetry order of an object is the number of different but indistinguishable (or equivalent) arrangements (or views) of the object, that is, it is the order of its symmetry group. The object can be a molecule, crystal lattice, lattice, tiling, or in general any kind of mathematical object that admits symmetries. [1]

  7. Molecular term symbol - Wikipedia

    en.wikipedia.org/wiki/Molecular_term_symbol

    [4] [5] [6] For example, two like atoms in identical 3 S states can form a diatomic molecule in 1 Σ g +, 3 Σ u +, or 5 Σ g + states. For one like atom in a 1 S g state and one in a 1 P u state, the possible diatomic states are 1 Σ g +, 1 Σ u +, 1 Π g and 1 Π u. [5] The parity of an atomic term is g if the sum of the individual angular ...

  8. MadeGood granola bars recalled because they could contain metal

    www.aol.com/madegood-granola-bars-recalled...

    Recalled MadeGood granola bars were sold across the U.S. and internationally, according to food maker.

  9. Molecular orbital diagram - Wikipedia

    en.wikipedia.org/wiki/Molecular_orbital_diagram

    The possible orbital symmetries are listed in the table below. For example, an orbital of B 1 symmetry (called a b 1 orbital with a small b since it is a one-electron function) is multiplied by -1 under the symmetry operations C 2 (rotation about the 2-fold rotation axis) and σ v '(yz) (reflection in the molecular