1. 
   Tetravalence
   In chemistry, a tetravalence is the state of an atom with four electrons available for covalent chemical bonding in its valence (outermost electron shell). An example is methane (CH4): the tetravalent carbon atom forms a covalent bond with four hydrogen atoms. The carbon atom is called tetravalent ...
   Found op http://en.wikipedia.org/wiki/Tetravalence
   
   
2. 
   Tetravalence
   Te·trav'a·lence noun (Chemistry) The quality or state of being tetravalent; quadrivalence.
   Found op http://www.encyclo.co.uk/webster/T/35
   
   
3. 
   tetravalence
   <chemistry> The quality or state of being tetravalent; quadrivalence. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?tetravalence
   
   
4. 
   Tetravalence
   • (n.) The quality or state of being tetravalent; quadrivalence.
   Found op http://thinkexist.com/dictionary/meaning/tetravalence/
   
   

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