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.
Valence Shell Electron Pair Repulsion (VSEPR) Theory is a simple, qualitative model that allows the prediction of an approximate molecular shape, given a valid Lewis structure of a molecule.SEPR theory treats each pair of electrons at an atom  either bonds or lone pairs  as a localized region of electron density, directed outward from the atomic centre. The predicted molecular shape will be such that the bonds and lone pairs are arranged so as to minimize repulsions and maximize the space among them.