Question

ammonium iodide is a polyatomic ionic compound. it was historically used to create tintypes, a type of photograph made by applying light - sensitive chemicals to a thin sheet of iron. write the chemical formula for ammonium iodide. refer to a periodic table and a list of polyatomic ions.

Explanation:

Step1: Identify the ions

Ammonium ion is $\text{NH}_4^+$ and iodide ion is $\text{I}^-$.

Step2: Balance the charges

The +1 charge of ammonium ion and - 1 charge of iodide ion balance each other.

Answer:

$\text{NH}_4\text{I}$