(atom group having the valence of two)

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• Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …   Wikipedia

• carbon group element — ▪ chemical elements Introduction  any of the five chemical elements that make up Group 14 (IVa) of the periodic table namely, carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead ( …   Universalium

• nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

• boron group element — ▪ chemical elements Introduction  any of the five chemical elements constituting Group 13 (IIIa) of the periodic (periodic law) table (see Figure >). The elements are boron (B), aluminum (Al), gallium (Ga), indium (In), an …   Universalium

• dyad — /duy ad/, n. 1. a group of two; couple; pair. 2. Biol. a. a secondary morphological unit, consisting of two monads: a chromosome dyad. b. the double chromosomes resulting from the separation of the four chromatids of a tetrad. 3. Chem. an element …   Universalium

• dyad — dy•ad [[t]ˈdaɪ æd[/t]] n. 1) a group of two; couple; pair 2) biochem. cbl the double chromosomes resulting from the separation of the four chromatids of a tetrad 3) chem. an element, atom, or group having a valence of two 4) math. Math. two… …   From formal English to slang

• chemical industry — Introduction       complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives.       Although the chemical industry may be described simply as the industry that uses chemistry and… …   Universalium

• multivalent — 1. In chemistry, having a combining power (valence) of more than one hydrogen atom. 2. Efficacious in more than one direction. 3. An antiserum specific for more than one antigen or organism. 4. Antigen or antibody with a combining …   Medical dictionary

• triad — triadic, adj. triadism, n. /truy ad, euhd/, n. 1. a group of three, esp. of three closely related persons or things. 2. Chem. a. an element, atom, or group having a valence of three. Cf. monad (def. 2), dyad (def. 3) …   Universalium

• Actinide — The atomic bomb dropped on Nagasaki had a plutonium charge.[1] The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium thro …   Wikipedia

• materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …   Universalium