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Share. By Anne Marie Helmenstine, Ph.D. Definition: A pi bond is a covalent bond formed between two neighboring atom's unbonded p-orbitals. An unbound p-orbital electron in one atom forms an electron pair with a neighboring atom's unbound, parallel p-orbital electron.This electron pair forms the pi bond.hare. By Anne Marie Helmenstine, Ph.D. Definition: A pi bond is a covalent bond formed between two neighboring atom's unbonded p-orbitals. An unbound p-orbital electron in one atom forms an electron pair with a neighboring atom's unbound, parallel p-orbital electron.
To count sigma and pi bonds, first you need to know how many single, double and triple bonds are present in the molecule. A single bond contains one sigma bond (direct head-on overlap of orbitals). www.chem.ucla.edu For example, the C-C sigma bond in ethane is formed by the head-on overlap of two spÂ³ orbitals.