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.
The place is recorded in the Domesday Book of 1086 as Rovecestre. Rochester in Northumberland is thought to have been named from the place in Kent, or the first element may be the Old English hroc, rook. The modern surname from either of these sources can be found as Rochester, Rogister, and Rossiter.