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In an ethane molecule, which has the chemical formula C₂H₆, the primary type of bond that holds the atoms together is covalent bonds. Covalent bonds form when two atoms share one or more pairs of electrons. In ethane, each carbon atom shares electrons with three hydrogen atoms and with the other carbon atom, resulting in a stable arrangement of atoms. This sharing of electrons allows the atoms to achieve a full outer electron shell, which is energetically favorable.

Covalent bonding is particularly characteristic of organic molecules like ethane, as they are composed mostly of carbon and hydrogen. The strong attraction between the shared electrons and the nuclei of the bonded atoms provides the necessary stability for the molecule. This is why covalent bonds are specifically responsible for the structure of ethane, leading to its classification as an alkane in organic chemistry.