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.
Yavapai County is near the center of the U.S. state of Arizona. As of the 2010 census, its population was 211,073. The county seat is Prescott. Yavapai County comprises the Prescott, AZ Metropolitan Statistical Area.