Question

what is the correct formula for ammonium?
ammonium: $\ce{nh_{4}^{+}}$
ammonium: $\ce{nh_{4}^{3+}}$
ammonium: $\ce{nh^{4+}}$

Explanation:

Step1: Recall ammonium ion structure

Ammonium forms when $\text{NH}_3$ gains 1 proton.

Step2: Confirm correct formula

The resulting ion has formula $\text{NH}_4^+$ with +1 charge.

Answer:

A. ammonium: $\text{NH}_4^+$