The NH4 asked about is the amonium ion, and it's written NH4+ to indicate it has a positive charge (+1). It's a cation. Wikipedia has more information on this chemically â¦ significant polyatomic ion, and you'll find that a link to that post is provided below. + 7 others found this useful.
Gilbert is a town in Maricopa County, Arizona, United States, just southeast of Phoenix, within the Phoenix metropolitan area.
Search form. Pinal County. Pinal County is located in central Arizona, and is one of two counties that comprise the Phoenix-Mesa-Scottsdale Metropolitan Statistical Area. As of the most recent census, Casa Grande is the largest city, with 48,751 residents.