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Bond length
Bond length, also called bond distance, is the distance between the atomic centers involved in a chemical bond, commonly reported in picometers or ångströms; higher bond order means shorter bonds.
Chemical structure
A chemical structure is the arrangement of atoms in a molecule: which atoms are present, how they connect, and their three-dimensional positions, from constitution to conformation.
Molecular geometry
Molecular geometry, or molecular shape, is the three-dimensional arrangement of atoms in a molecule, described by bond lengths, bond angles, and torsion angles; it determines molecular polarity.
Octahedral molecular geometry
Octahedral molecular geometry is the arrangement of six atoms or ligands around a central atom at the corners of an octahedron, with 90° bond angles, as in sulfur hexafluoride.
Tetrahedral molecular geometry
Tetrahedral molecular geometry places a central atom at the center of a tetrahedron with four atoms at its corners, giving bond angles of 109.5°, as in methane.
Trigonal bipyramidal molecular geometry
Trigonal bipyramidal molecular geometry is the arrangement of five atoms or electron regions around a central atom: three equatorial positions and two axial ones, seen in PCl5.