Iodide is a better nucleophile than bromide.

Explanation

To determine whether iodide (I⁻) is a better nucleophile than bromide (Br⁻), we can analyze the properties of these two halide ions based on their position in the periodic table and their chemical behavior.

### Step-by-Step Solution:

1. **Definition of Nucleophile**:
- A nucleophile is a chemical species that donates an electron pair to form a chemical bond in a reaction. Nucleophiles can be negatively charged or neutral and are characterized by their ability to attack electron-deficient sites in other molecules.

**Hint**: Remember that nucleophiles are "nucleus-loving" and are often electron-rich species.

2. **Position in the Periodic Table**:
- Iodide (I⁻) and bromide (Br⁻) are both halogens and belong to Group 17 of the periodic table. As we move down the group from fluorine (F) to iodine (I), the size of the atoms increases.

**Hint**: Look at the periodic trends; size and electronegativity are key factors.

3. **Size and Electronegativity**:
- Iodine is larger than bromine, which means that the bond length in I⁻ is longer than in Br⁻. Larger atoms have their valence electrons further from the nucleus, which makes them less tightly held.

**Hint**: Larger atoms tend to have lower electronegativity, which affects their ability to donate electrons.

4. **Nucleophilicity Trend**:
- As we move down the group, the electronegativity decreases. Iodine has a lower electronegativity compared to bromine, which means it can more readily donate its lone pair of electrons.

**Hint**: Consider how electronegativity influences the ability of an atom to hold onto its electrons.

5. **Conclusion**:
- Since iodide (I⁻) is larger and has a lower electronegativity than bromide (Br⁻), it is a better nucleophile. This is because it can more easily donate its lone pair of electrons to an electrophile.

**Hint**: Remember that the ability to donate electrons is crucial for nucleophilicity.

### Final Answer:
The statement "Iodide is a better nucleophile than bromide" is **correct**. As we move down the group in the periodic table, nucleophilicity increases due to the increase in atomic size and decrease in electronegativity.