Highest size will be of

Options

A. `Br^(-)`
B. `I`
C. `I^(-)`
D. `I^(+)`

Answer

To determine which species has the highest size among bromide ion (Br⁻), iodine (I), iodide ion (I⁻), and iodine positive (I⁺), we can follow these steps:

### Step 1: Understand the Effect of Charge on Size
- Negative ions (anions) have more electrons than protons, resulting in increased electron-electron repulsion. This leads to an increase in the size of the ion.
- Positive ions (cations) have fewer electrons than protons, resulting in decreased electron-electron repulsion and a smaller size.

**Hint:** Remember that anions are larger than their neutral atoms, and cations are smaller than their neutral atoms.

### Step 2: Compare the Species
- **Bromide ion (Br⁻)**: This ion has gained an electron, making it larger than neutral bromine (Br).
- **Iodine (I)**: This is the neutral atom and serves as a baseline for comparison.
- **Iodide ion (I⁻)**: This ion has gained an electron, making it larger than neutral iodine (I).
- **Iodine positive (I⁺)**: This ion has lost an electron, making it smaller than neutral iodine (I).

**Hint:** Identify which species are anions and cations, and recall how gaining or losing electrons affects size.

### Step 3: Analyze the Group Trend
- In the periodic table, as you move down a group, the size of the atoms/ions increases due to the addition of electron shells.
- Bromine (Br) is above iodine (I) in the periodic table, meaning that bromine is smaller than iodine.

**Hint:** Use the periodic table to determine the relative positions of the elements and how that affects their sizes.

### Step 4: Compare the Sizes of Anions
- Between bromide ion (Br⁻) and iodide ion (I⁻), since iodine is below bromine in the periodic table, the iodide ion will be larger than the bromide ion.

**Hint:** Compare the sizes of the anions based on their positions in the periodic table.

### Conclusion
- The order of size from largest to smallest is: I⁻ > Br⁻ > I > I⁺.
- Therefore, the species with the highest size is the **iodide ion (I⁻)**.

**Final Answer:** The highest size will be of **iodide ion (I⁻)**.