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.
Maricopa County. Maricopa County is located in central Arizona. The county has a total land area of 9,224 square miles, making it the fifth largest county in Arizona. Maricopa County is the most populous county in Arizona, comprising about 57% of the states population. As of the 2010 census, Phoenix is the largest city, with a population of 1,445,632.