What are the different areas of an electron cloud called?

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.

What is the oxidation state of each individual carbon atom in c2o42−?