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.
The Territory of Arizona is divided into ten counties, namely: Pima, Yavapai, Maricopa, Mohave, Apache, Yuma, Pinal, Cachise, Gila, and Graham. Pima county, the oldest inhabited portion of the Territory, is bounded on the north by Maricopa and Pinal, on the east by Cachise, on the south by Sonora, and on the west by Yuma county.