A single bond has only one pair of shared electrons between the nuclei of two adjacent atoms. A red arrow points to the single bond in both molecular models constructed with two different molecular kits. Note that free 360 degree rotation exists between the two atoms in a single bond.
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| Molecular model of ethane - kit 1 | Molecular model of ethane - kit 2 |
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| Structural formula of ethane - C2H6 |
