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.
Gilbert, AZ Weather Gilbert, AZ climate is very hot during summer when temperatures tend to be in the 90's and cool during winter when temperatures tend to be in the 50's. The warmest month of the year is July with an average maximum temperature of 99.99 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 40.50 degrees Fahrenheit.