The ion in question is [tex]\( NH_4^{+1} \)[/tex]. To identify this ion, let's analyze its components and charge systematically.
1. The formula [tex]\( NH_4^{+1} \)[/tex] consists of one nitrogen (N) atom and four hydrogen (H) atoms.
2. The overall positive charge (+1) indicates that this group of atoms has lost one electron.
3. In common chemical nomenclature, the combination of one nitrogen atom with four hydrogen atoms, resulting in a polyatomic ion with a +1 charge, is well-known among chemists.
4. Among the given options:
- "nitrogen qaudhydride" isn't a recognized name for this ion.
- "ammonia" is the common name for [tex]\( NH_3 \)[/tex], a neutral molecule.
- "ammonium" refers to the [tex]\( NH_4^{+1} \)[/tex] ion.
- "hydronium" refers to the [tex]\( H_3O^{+} \)[/tex] ion, which is different.
Thus, based on the structure and charge, the correct name for this ion is "ammonium."
The correct answer is:
[tex]\[ \boxed{\text{ammonium}} \][/tex]
