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.
Jerome, Arizona, incorporated in 1899, is located in Yavapai County, approximately 100 miles north of Phoenix and 45 miles southwest of Flagstaff on State Highway 89A. The town sits perched on a hillside at an elevation of over 5,000 feet in the Black Hills of Arizona.