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.
There are 2 main types of bonds in Chemistry. They are covalent and ionic bonds. Ionic bonds are when ions bond together in order to from a full valence shell. Covalent bonds are where normal atoms share their electrons to have a full valence shell. There are also hydrogen bonds. Notice that the whole purpose of bonding is to create the octet valence shell.