The ammonium ion has a formula of NH4+ and has a positive charge so it is a cation.
Arnold /ar-nold/ [2 sylls.] as a boys' name is pronounced AR-nold. It is of Old French and Old German origin, and the meaning of Arnold is eagle ruler.From the phrase arn wald. Brought to Britain with the Norman invasion, lost popularity after the 13th century, and briefly revived in the late 19th century.rnold /ar-nold/ [2 sylls.] as a boys' name is pronounced AR-nold. It is of Old French and Old German origin, and the meaning of Arnold is eagle ruler.
There have been a number of explanations as to how the name Foster originated in England. The main line is that Foster is a contracted spelling of Forester, a term which described an official in charge of a forest.In the Middle Ages, the forests and woods were almost always owned or controlled by the lord of the manor.s in England, the name means forester or forest ranger. Forster may also have been an inhabitant of Forst, a town in the Rheinpfalz. For immigrants into America, the name has often been anglicized to Foster.