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  2. Molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Molecular_geometry

    Trigonal pyramidal: A trigonal pyramidal molecule has a pyramid-like shape with a triangular base. Unlike the linear and trigonal planar shapes but similar to the tetrahedral orientation, pyramidal shapes require three dimensions in order to fully separate the electrons.

  3. Trigonal pyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Trigonal_pyramidal...

    In chemistry, a trigonal pyramid is a molecular geometry with one atom at the apex and three atoms at the corners of a trigonal base, resembling a tetrahedron (not to be confused with the tetrahedral geometry). When all three atoms at the corners are identical, the molecule belongs to point group C 3v.

  4. Trigonal planar molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Trigonal_planar_molecular...

    In chemistry, trigonal planar is a molecular geometry model with one atom at the center and three atoms at the corners of an equilateral triangle, called peripheral atoms, all in one plane. [1] In an ideal trigonal planar species, all three ligands are identical and all bond angles are 120°. Such species belong to the point group D 3h.

  5. Geometry index - Wikipedia

    en.wikipedia.org/wiki/Geometry_index

    Print/export Download as PDF; Printable version; ... To distinguish whether the geometry of the coordination center is trigonal bipyramidal or square pyramidal, ...

  6. Triangular bipyramid - Wikipedia

    en.wikipedia.org/wiki/Triangular_bipyramid

    The same shape is also known as a triangular dipyramid [1] [2] or trigonal bipyramid. [3] If these tetrahedra are regular, all faces of a triangular bipyramid are equilateral . It is an example of a deltahedron , composite polyhedron , and Johnson solid .

  7. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    The hexagonal and trigonal crystal systems differ from the hexagonal and rhombohedral lattice systems. These are combined into the hexagonal crystal family. The relation between three-dimensional crystal families, crystal systems and lattice systems is shown in the following table:

  8. Trigonal bipyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Trigonal_bipyramidal...

    In chemistry, a trigonal bipyramid formation is a molecular geometry with one atom at the center and 5 more atoms at the corners of a triangular bipyramid. [1] This is one geometry for which the bond angles surrounding the central atom are not identical (see also pentagonal bipyramid), because there is no geometrical arrangement with five terminal atoms in equivalent positions.

  9. Pentagonal bipyramid - Wikipedia

    en.wikipedia.org/wiki/Pentagonal_bipyramid

    The pentagonal bipyramid (or pentagonal dipyramid) is a polyhedron with ten triangular faces.It is constructed by attaching two pentagonal pyramids to each of their bases. . If the triangular faces are equilateral, the pentagonal bipyramid is an example of deltahedra, composite polyhedron, and Johnson sol