FTP, name these compounds in which ligands surround a central metal atom.
Alizarin dye was the first of this class of compounds to be known.  The noble gas rule states that the most stable are those whose central atom has 18 valence electrons, including molybdenum, cobalt and nickel.  Characterized by a number that gives the number of bonds from the surroundings to the central atom, with 4 and 6 being the most common, examples include uranium hexafluoride, vitamin B12 and hemoglobin.  If they are polydentate, they are called chelates.  FTP, name these compounds in which ligands surround a central metal atom.
Alizarin dye was the first of this class of compounds to be known.  
coordination compound or complex