Transition metals often form coordinate covalent bonds with ligands in which

Transition metals often form coordinate covalent bonds with ligands in which

 a.
two electrons in a d orbital on the metal ion are used, and an empty orbital on the ligand.
 b.
two electrons are transferred from the ligand to the metal.
 c.
two electrons in an orbital on the ligand are used, and an empty d orbital on the metal ion.
 d.
a single electron from a d-orbital on the metal and a single electron from the ligand are involved.
 e.
two electrons are transferred from the metal to the ligand.


Which property does not enhance the usefulness of sodium as a heat transfer medium in nuclear reactors?
   
 a.
It has a high thermal conductivity.
 b.
It can easily be liquefied.
 c.
It has an unusually high heat capacity.
 d.
It has a very low melting point.
 e.
It is extremely reactive toward water.