Final answer:
In ethane (C2H6), all the electrons are involved in bonding and there are no lone pairs of electrons.
Step-by-step explanation:
The molecule in question is ethane, with a molecular formula of C2H6. Ethane consists of two carbon atoms joined by a single covalent bond, with each carbon atom also bonded to three hydrogen atoms. In ethane, each carbon atom uses its four valence electrons to form four covalent bonds—one with the other carbon atom and three with hydrogen atoms. This leaves no lone pairs of electrons, as all electrons are involved in bonding. Therefore, in a molecule of ethane, there are no electrons that are not involved in bonding.
Additionally, ethane belongs to the alkane family and is a saturated hydrocarbon, meaning it contains only single covalent bonds between its carbon atoms. The tetrahedral arrangement of the hydrogen atoms around each carbon atom results in a symmetrical and stable molecular structure.