That's pretty much it. Why do they have 0 Oxidation state?
Oxidation number is like a hypothetical value for the charge of the individual species if a compound was considered ionic(atleast that's what i understood).
So when we say the OS of metals in metal carbonyls is 0, are we saying that they can never donate any electrons? I am confused , i don't understand.
Carbonyls aren't ionic.
Why 'never'? They don't in carbonyls, they do in other compounds.
Separate names with a comma.