21. The carbon atom has two additional single bonds . 22. In chemistry, a "'single bond "'is a chemical bond between two atoms involving two valence electrons. 23. The distinction is often important, because the double bond is chemically different from two single bonds . 24. Last year, a Washington-based appeals court said all members of that institution must share a single bond . 25. It also accounts for the free rotation around single bonds and for the tetrahedral geometry of methane. 26. To preserve valence 4 for carbons, the opposite corners of the hexagon are connected by single bonds . 27. The compound is protonated on another side, whereas a single bond and a double bond are exchanged. 28. Both MM2 and ECEPP include potentials for H-bonds and torsion potentials for describing rotations around single bonds . 29. Note that when used to refer to moieties, multiple single bonds differ from a single multiple bond. 30. By behaving as two discrete alkenes joined by two single bonds , and therefore non-aromatic rather than antiaromatic.
