State, whether the following statements is True or False:
An anion is larger than a cation if they are iso-electronic

Answer

To determine whether the statement "An anion is larger than a cation if they are iso-electronic" is true or false, we can analyze the concepts of anions, cations, and iso-electronic species step by step.

### Step-by-Step Solution:

1. **Understanding Iso-electronic Species**:
- Iso-electronic species are atoms or ions that have the same number of electrons. For example, Na⁺ (sodium ion) and F⁻ (fluoride ion) both have 10 electrons.

2. **Analyzing the Size of Anions and Cations**:
- An anion is formed when an atom gains one or more electrons. This gain of electrons increases electron-electron repulsion and can lead to an increase in size due to the added electron(s) and the resulting decrease in effective nuclear charge felt by the electrons.
- A cation is formed when an atom loses one or more electrons. The loss of electrons reduces electron-electron repulsion and increases the effective nuclear charge on the remaining electrons, resulting in a decrease in size.

3. **Comparing Sizes of Anions and Cations**:
- Since anions have more electrons than cations (in the case of iso-electronic species), the increased electron-electron repulsion in anions leads to a larger size compared to cations, which have fewer electrons and a stronger effective nuclear charge pulling the remaining electrons closer to the nucleus.

4. **Conclusion**:
- Therefore, the statement "An anion is larger than a cation if they are iso-electronic" is **True**.

### Final Answer:
True