Question

what is the formula for ammonium bromide? what is the formula for ammonium sulfite? what is the formula for ammonium fluoride?

Explanation:

Step1: Recall ion charges

Ammonium ion is $NH_4^+$. Bromide ion is $Br^-$, sulfite ion is $SO_3^{2 -}$, fluoride ion is $F^-$.

Step2: Determine compound formulas

For ammonium bromide, one $NH_4^+$ and one $Br^-$ combine to give $NH_4Br$. For ammonium sulfite, two $NH_4^+$ are needed to balance the $2 -$ charge of $SO_3^{2 -}$, giving $(NH_4)_2SO_3$. For ammonium fluoride, one $NH_4^+$ and one $F^-$ combine to give $NH_4F$.

Answer:

Ammonium bromide: $NH_4Br$
Ammonium sulfite: $(NH_4)_2SO_3$
Ammonium fluoride: $NH_4F$