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.
Jerome is located in Yavapai County, on the slopes of Cleopatra Hill. Post office opened on September 10, 1883 and is still in use. Once in time Jerome was fifth biggest town in Arizona, but now is reduced to capitol of the ghost towns.