**tetrahedral angle** — noun : a polyhedral angle of four faces … Useful english dictionary

**Tetrahedral** — Tet ra*he dral, a. [See {Tetrahedron}.] 1. Having, or composed of, four sides. [1913 Webster] 2. (Crystallog.) (a) Having the form of the regular tetrahedron. (b) Pertaining or related to a tetrahedron, or to the system of hemihedral forms to… … The Collaborative International Dictionary of English

**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 cos−1(−1/3) ≈ 109.5° when all four substituents are the same, as in CH4. This … Wikipedia

**tetrahedral** — adjective Date: 1794 1. being a polyhedral angle with four faces 2. relating to, forming, or having the form of a tetrahedron • tetrahedrally adverb … New Collegiate Dictionary

**Bürgi-Dunitz angle** — The Bürgi Dunitz angle describes the angle of attack of a nucleophile at a carbonyl center. The angle was named after H. B. Bürgi and J.D. Dunitz, its principal investigators. The Bürgi Dunitz angle depends not upon the nature of the nucleophile… … Wikipedia

**Binary tetrahedral group** — In mathematics, the binary tetrahedral group is an extension of the tetrahedral group T of order 12 by a cyclic group of order 2.It is the binary polyhedral group corresponding to the tetrahedral group, and as such can be defined as the preimage… … Wikipedia

**Solid angle** — The solid angle, Ω , is the angle in three dimensional space that an object subtends at a point. It is a measure of how big that object appears to an observer looking from that point. For instance, a small object nearby could subtend the same… … Wikipedia

**Bite angle** — Chelate bite angle is a geometric parameter used to classify chelating ligands in inorganic and organometallic chemistry. Together with ligand cone angle, this parameter is relevant to diphosphine ligands, which are used in industrial processes… … Wikipedia

**Tetrahedron** — For the academic journal, see Tetrahedron (journal). Regular Tetrahedron (Click here for rotating model) Type Platonic solid Elements F = 4, E = 6 V = 4 (χ = 2) Faces by s … Wikipedia

**chemical bonding** — ▪ chemistry Introduction any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another … Universalium