What are Epididymitis and Orchitis? Pain in the scrotum or testicle (âtesteâ) might be from epididymitis, orchitis or both. Epididymitis is swelling or pain in the back of the testicle in the coiled tube (epididymis) that stores and carries sperm.
Share. By Anne Marie Helmenstine, Ph.D. Definition: Valence bond theory is a chemical bonding theory that explains the bonding between two atoms is caused by the overlap of half-filled atomic orbitals. The two atoms share each other's unpaired electron to form a filled orbital to form a hybrid orbital and bond together.
Tetrahedral Bond Angles. The structure of organic molecules can be explained on the basis of valence bond theory or VSEPR (Valence shell electron pair repulsion theory). The valence bond theory is based on the concept of hybridisation. Hybridisation involves the mixing of atomic orbitals to form same number of hybrid orbitals.