Answer: There are 3 different types of elements in the given compound.
Step-by-step explanation:
Elements are defined as the smallest unit which cannot be further divided. These have same types of atoms. For Example: Carbon (C), Hydrogen (H), etc..
For a given chemical compound

There are 3 different kinds of elements which are nitrogen (N), hydrogen (H) and oxygen (O).
In 1 mole of ammonium hydroxide, 1 mole of nitrogen atoms, 5 moles of hydrogen atoms and 1 mole of oxygen atom is present.
Thus, there are 3 different types of elements in the given compound.