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.
Matthew Arnold was an English poet and cultural critic who worked as an inspector of schools. He was the son of Thomas Arnold, the famed headmaster of Rugby School, and brother to both Tom Arnold, literary professor, and William Delafield Arnold, novelist and colonial administrator. Matthew Arnold has been characterised as a sage writer, a type of writer who chastises and instructs the reader on contemporary social issues.