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.
Joseph Arnold. For the Rhode Island resident, see Joseph Arnold (Rhode Island). Joseph Arnold (28 December 1782 â 26 July 1818 in Padang, Sumatra, Netherlands East Indies) was a naval surgeon and naturalist. His specimen collection is in the museum of the Linnean Society. Born in Beccles, Suffolk, he learned surgery in Edinburgh and received a diploma in 1807.