Answer:
The answer to your question is below
Step-by-step explanation:
Elements Compounds
1.- Cu (Copper) NaCl (sodium chloride)
2.- Ag (Silver) HNO₃ (nitric acid)
3.- Al (aluminum) KOH (potassium hydroxide)
They are similar because that are composed by elements, they are different because elements are composed by only 1 element and compounds are composed by 2 or more elements.
Elements are simple and compounds are more complex structures.