Question

1. use the periodic table to choose the best answer. what is the name of this compound: cu₃n copper (i) nitride copper (iii) nitride tricopper nitride copper nitride 5. choose the best answer using a periodic table. what is the name of this compound: cai₂ calcium iodine monocalcium iodide calcium iodide calcium diodide

Explanation:

Step1: Analyze $\text{Cu}_3\text{N}$ charge balance

Copper (Cu) is a transition metal; nitrogen (N) has a -3 charge. For neutral $\text{Cu}_3\text{N}$, total positive charge = +3. Each Cu has charge $\frac{+3}{3}=+1$.

Step2: Name $\text{Cu}_3\text{N}$

Transition metals need charge in parentheses. Name is copper (I) nitride.

Step3: Analyze $\text{CaI}_2$ charge balance

Calcium (Ca) is group 2, has +2 charge. Iodine (I) has -1 charge. 2 iodides balance +2 charge.

Step4: Name $\text{CaI}_2$

Group 2 metals don't need charge labels. Name is calcium iodide.

Answer:

1. copper (I) nitride
2. calcium iodide