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The question isn't clear. If you meant "CO2" then it's carbon dioxide. But "Co" means cobalt. Neither "Co2" nor "Co2" make sense chemically. The first one simply doesn't mean anything at all, and the second one would mean a compound of 2 atoms of cobalt bound togenter chemically, but that's not how cobalt occurs.

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15y ago

What else can I help you with?