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 type of bond an atom forms is relative to the behavior of their valence electrons and electronegativity values. The difference in electronegativity between atoms determines if they form a covalent bond or a ionic bond. In an ionic bond, one atom donates its valence electrons to another atom. The electron donor becomes positively charged, and the electron receiver becomes negatively charged. These charged particles become attracted to each other and bond to become stable and neutralize their charges. In a covalent bond, atoms share valence electrons. This allows the atoms to stabilize their inherent charges and become unreactive. Atoms that belong to the noble gas group of elements are generally unreactive and do not form chemical bonds because their valence electron shells are completely full and balanced.