The phrase lewis dot diagram for c2h6 refers to the Lewis electron-dot representation of ethane, C2H6, showing how its valence electrons are organized into shared bonding pairs. Ethane contains only single (sigma) bonds: one C–C bond and six C–H bonds.
Valence-electron accounting for C2H6
Carbon contributes 4 valence electrons per atom, and hydrogen contributes 1 valence electron per atom. With two carbons and six hydrogens, the total valence-electron count is 14.
| Element | Count | Valence electrons per atom | Total contributed |
|---|---|---|---|
| C | 2 | 4 | \(2 \times 4 = 8\) |
| H | 6 | 1 | \(6 \times 1 = 6\) |
| Total | \(8 + 6 = 14\) |
Bonding pairs and octet/duet satisfaction
Ethane is built from seven shared electron pairs (seven single bonds): six C–H bonds and one C–C bond. Those seven bonds account for all 14 valence electrons as bonding electrons.
Each carbon is surrounded by four bonding pairs (three to H and one to the other C), which corresponds to an octet around carbon. Each hydrogen is surrounded by one bonding pair, which corresponds to a duet around hydrogen.
The Lewis dot diagram for C2H6 contains no lone pairs on carbon and uses all 14 valence electrons in bonding.
Formal charges and local geometry around carbon
The single-bond framework assigns zero formal charge to every atom in ethane. Each carbon has four bonds and no lone pairs, and each hydrogen has one bond, matching the typical valence expectations for neutral atoms in an alkane.
The electron-domain arrangement around each carbon is tetrahedral (four electron domains), consistent with an sp3 description and approximate bond angles near \(109.5^\circ\) in a 3D model. The Lewis structure is a 2D accounting diagram; the tetrahedral geometry is the 3D interpretation of the same bonding.
Common pitfalls
A double bond between the two carbons conflicts with the hydrogen count in C2H6 and would correspond to C2H4 instead. Lone pairs on carbon also contradict the four-bond, neutral-carbon pattern in ethane; the electron count is fully accommodated by seven single bonds with zero formal charges.
Direct conclusion
The Lewis dot diagram for C2H6 consists of H3C–CH3 with seven single bonds total, using 14 valence electrons as seven shared bonding pairs and leaving no lone pairs on carbon.