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.
Pinal County, Arizona. Pinal County is a county in the central part of the U.S. state of Arizona. As of the 2010 census, the population was 375,770, making it Arizona's third-most populous county. The county seat is Florence. The county was founded in 1875.