Question

2.) what is the correct ionic formula for chromium (ii) iodide?
○ cr₂i₂
○ cri₂
○ cr₂i
○ cri

Explanation:

Step1: Determine ion charges

Chromium (II) means $\text{Cr}^{2+}$ (since the Roman numeral II indicates a +2 charge). Iodide is $\text{I}^-$ (iodine gains one electron to form the iodide ion).

Step2: Balance charges

To balance the charges, we need two $\text{I}^-$ ions to neutralize one $\text{Cr}^{2+}$ ion (because $2\times(-1) + (+2) = 0$). So the formula is $\text{CrI}_2$.

Answer:

B. $\text{CrI}_2$ (assuming the second option is labeled as B, with the option text $\text{CrI}_2$)