It uses convalent bonding.
The harmful compound is carbon monoxide. It consists of one atom of oxygen and an atom of carbon. Carbon monoxide is is a colorless, odorless and tasteless gas which is slightly lighter than air. It is highly toxic to humans and animals in higher quantities, and can poison humans. Oxygen is one of the most important gases on earth, and living things use it for respiration, and is a highly reactive nonmetallic element that readily forms compounds (notably oxides) with almost all other elements. For carbon, There are several allotropes of carbon of which the best known are graphite, diamond, and amorphous carbon. The physical properties of carbon vary widely with the allotropic form. All forms of carbon are highly stable, requiring high temperature to react even with oxygen, and in the human body carbon is the second most abundant element by mass (about 18.5%) after oxygen.The two harmless elements that make up carbon monoxide is carbon and oxygen. To get this compound we have to use convalent bonding. Since oxygen has 8 electrons and 6 valence electrons, we need 2 more valence electrons to make it obtain an octet structure. A carbon atom has 6 electrons and 4 valence electrons. Thus to make both of them obtain an octet structure, we need to share two of carbon's valence electrons and 4 of oxygen's valence electrons. Thus both elements will have 8 valence electrons, making both elements stable when convalent bonding happens between them.
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