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.
Pleasant weather, diverse amenities and low crime rates draw families and retirees alike to Gilbert, Arizona. The city has grown at an exceptional pace; in 1980, only 5,000 people called the city home. Today, the population is well over 200,000.