Somerville, Alabama. The Somerville Courthouse was built in 1837 in the Federal style. It served as the county courthouse for Morgan County until the county seat was moved from Somerville to Decatur in 1891. It was listed on the National Register of Historic Places on March 24, 1972. Somerville is a town in Morgan County, Alabama, United States. It is included in the Decatur Metropolitan Area, as well as the Huntsville-Decatur Combined Statistical Area. As of the 2010 census, the population of the town was 724, up from 347.
Polyatomic Ions. Polyatomic ions are ions that are composed of two or more atoms that are linked by covalent bonds, but that still have a net deficiency or surplus of electrons, resulting in an overall charge on the group. A metal plus a polyatomic ion yields an ionic compound. Formulas and Names of Some Polyatomic Ions
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.