Carbon can form up to how many covalent bonds with other atoms?

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Carbon forms up to four covalent bonds because it has four electrons in its outer shell that it can share to complete a full octet. This means carbon can link to four atoms in total, whether as four single bonds, or a combination like a triple bond to one atom plus a single bond to another, or two double bonds. In methane, carbon makes four single bonds to hydrogens; in carbon dioxide, it forms two double bonds, which together still total four bonds around carbon. If carbon formed fewer than four bonds, it wouldn’t reach a full octet and be less stable; more than four bonds isn’t possible for carbon under normal circumstances. So the maximum number of covalent bonds carbon can form with other atoms is four.