NH4 is called Ammonium
NH4+ is called the Ammonium ion...
Lewis structures say the valence on a
NH4 has 9 valence electrons and Nitrogen needs a electron count of 5 for no formal charge, the number of bonds with the hydrogen count on the molecule make 8 used electrons for 9 - 8 = 1 therefore NH4 would have no formal charge if the was a free radical circling around the Nitrogen in the molecule...
is it possible for NH4 to have a free radical on the molecule around the Nitrogen to have no formal charge?