To complete the table with the empirical formulas for calcium iodide and rubidium bromide, let’s go through the step-by-step process to identify these formulas.
### Step-by-Step Solution:
1. Understanding the Compounds:
- Calcium Iodide:
- Calcium is a metal with the chemical symbol Ca.
- Calcium typically forms a +2 charge as a cation (Ca²⁺).
- Iodine is a non-metal with the chemical symbol I.
- Iodine typically forms a -1 charge as an anion (I⁻).
2. Balancing the Charges for Calcium Iodide:
- Each calcium ion (Ca²⁺) requires two iodide ions (I⁻) to balance the charges.
- The ratio of calcium to iodide ions is 1:2.
- Therefore, the empirical formula for calcium iodide is CaI₂.
3. Understanding the Compounds:
- Rubidium Bromide:
- Rubidium is a metal with the chemical symbol Rb.
- Rubidium typically forms a +1 charge as a cation (Rb⁺).
- Bromine is a non-metal with the chemical symbol Br.
- Bromine typically forms a -1 charge as an anion (Br⁻).
4. Balancing the Charges for Rubidium Bromide:
- Each rubidium ion (Rb⁺) requires one bromide ion (Br⁻) to balance the charges.
- The ratio of rubidium to bromide ions is 1:1.
- Therefore, the empirical formula for rubidium bromide is RbBr.
### Completion of the Table:
[tex]\[
\begin{array}{|c|c|}
\hline
\text{name} & \text{empirical formula} \\
\hline
\text{calcium iodide} & \text{CaI}_2 \\
\hline
\text{rubidium bromide} & \text{RbBr} \\
\hline
\end{array}
\][/tex]
By following the above steps, the empirical formulas for calcium iodide and rubidium bromide are CaI₂ and RbBr, respectively.
