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.
The number of covalent bonds that an atom can form is limited by its number of valence electrons. Carbon has four valence electrons, and it can use each of these four electrons for bonding. Continue Reading. The formation of four covalent bonds does not necessarily mean that carbon must bond with four atoms. It can form two double bonds, as in CO2; it could form a triple bond and a single bond, as in C2H2; or it could form a double bond and two single bonds, as in CH2O (formaldehyde). Related Questions.