Electron count in a complex the covalent model

Consider a monometallic complex in which the transition metal M is bound to a certain number of ligands (Lig), that may be either atoms or molecules. It is important to note that, in the covalent model, one always considers the ligands in their neutral form (H, Cl, O, CO, CN, PR3, CH3, etc.). Before making the formal electronic assignment for the complex, one must first categorize the ligands according to the nature of then-electronic structure. 

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There are two ways to obtain this formal distribution of the electrons (or electron count) in a complex. The first, based on a covalent model of the metal-ligand bond, is mostly used in organometallic chemistry, that is, in complexes which possess one or more metal-carbon bonds. The second, based on an ionic model of the metal-ligand bond in which the two electrons are automatically attributed to the ligand, is more frequently employed for inorganic complexes. In fact, the choice between the two methods is largely a matter of taste, as they lead, as we shall see, to identical conclusions. 

Count the valence electrons in the complexes shown in problem 1, but using a different model (ionic or covalent) from the one you used originally. 

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