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.
Graham County is a county located in the southeastern part of the U.S. state of Arizona. As of the 2010 census, the population was 37,220, making it the third-least populous county in Arizona. The county seat is Safford. Graham County composes the Safford, AZ Micropolitan Statistical Area. The county is home to several organizations including Eastern Arizona College and the Mount Graham International Observatory, which includes one of the world's largest and most powerful telescopes.