The central metal is Co. It gets that name from the fact that the Co atom is in the middle of the "structure" with Cl and H2O molecules posted around it. Here is a site that show a little of what I'm talking about. Scroll about half way down the page to see it on the left hand side.
http://en.wikipedia.org/wiki/Cobalt%28II%29_chloride
The charge on the metal ion is +2. I THINK the abb electron structure is Co: but I've not seen that term before.
What do they mean by central metal, charge on metal ion and Abbreviated electron configuration for the electron ion? And I'm looking at CoCl2·6H20.
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