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.
Vail, Arizona. Vail is a census-designated place (CDP) in Pima County, Arizona, United States located Southeast of the nearby City of Tucson. The population was 10,208 at the 2010 census. The area is known for the nearby Colossal Cave, a large cave system, and the Rincon Mountains District of Saguaro National Park, a top tourism spot within Arizona.