Answer:
Step-by-step explanation:
Cu⁺ and S²⁻
You know the charge on copper is +1 and the charge on sulfur is -2. Use the "swap and drop" method to write the formula.
Swap the numbers and then drop them as the subscript for each element. Place the 2 as the subscript on copper and 1 as the subscript on sulfur.
Cu¹⁺ S²⁻
Cu₂S₁
Since we do not write the subscript when it is 1, do not use S₁. Use the formula shown below.
Formula = Cu₂S
You will use the same method to answer the other questions.
Ni²⁺ F¹⁻
Formula = NiF₂
Cr³⁺ Cl¹⁻
Formula = CrCl₃