So, in CO2, the carbon and the two oxygen atoms are all fully bonded with each other. None of the atoms (the carbon, the oxygen, or the other oxygen) have room to bond with anything else.
But CO is missing and O. It’s not fully bonded. Meaning it still has room/ability to bond with other molecules. Such as the molecules in your blood that are used to transport oxygen.
Which means if you breathe in a lot of CO, suddenly your blood is absorbing a LOT of CO, and not a lot of Oxygen, leading to carbon monoxide poisoning.
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