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.
Covalent bonding . One rule for predicting when an ionic bond will take place is when the difference between electronegativities is 1.7 or greater. In other cases atoms bond by sharing electrons on the valence shells. The force that holds two atoms together in this case is called a covalent bond. A covalent bond can be described as the mutual attraction that positive nuclei have for the shared, negatively charged bonding electrons.