Is both because is a compound and a molecule.
Cobalt is a chemical element and has atoms.
The element known as cobalt is present in many compounds.
Co2 would be a diatomic molecule of cobalt (Co), but since cobalt is a metal it does not form molecules and is simply Co. CO2 is not an element but a compound of the two elements carbon and oxygen. It is carbon dioxide.
Cobalt has an oxidation number of 3 (III) in the compound Co2O3.
Cobalt is an element
Cobalt is not so toxic.
The chemical formula for the compound of cobalt and sulfur is CoS (cobalt monosulfide).
atom
atom
Yes, cobalt form many chemical compounds as cobalt nitrate, cobalt chloride, cobalt sulfate, cobalt sulfide, etc.
A molecule
Water is both a compound and a molecule.