1. 
   Isosteres
   Molecules or ions of similar size containing the same number of atoms and valence electrons.
   Found op http://www.combichemistry.com/glossary_g.html
   
   
2. 
   Isosteres
   Isosteres are molecules or ions of similar size containing the same number of atoms and valence electrons, e.g., O^2-, F^-, Ne (See also Bioisostere).
   Found op http://www.chem.qmul.ac.uk/iupac/medchem/ix.html
   
   
3. 
   Isosteres
   Molecules or ions of similar size containing the same number of atoms and valence electrons.
   Found op http://www.combichemistry.com/glossary_g.html
   
   

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