Lattice energy of an ionic compound depedns upon :

Options

A. Option 1. Charge on the ion only
B. Option 2. Size of the ion only
C. Option 3. Packing of the ion only
D. Option 4. Charge and size of the ion

Answer

To determine the factors on which the lattice energy of an ionic compound depends, we can analyze the concept of lattice energy step by step.

### Step-by-Step Solution:

1. **Understanding Lattice Energy**:
- Lattice energy is defined as the amount of energy required to separate one mole of an ionic solid into its gaseous ions. This energy is a measure of the strength of the forces between the ions in an ionic compound.

2. **Factors Affecting Lattice Energy**:
- The lattice energy is influenced by two main factors: the charges of the ions and the distance between them.

3. **Charge of the Ions**:
- Lattice energy is directly proportional to the product of the charges of the ions. This means that if the charges on the ions increase, the lattice energy will also increase. For example, a compound formed from ions with charges +2 and -2 will have a higher lattice energy than one formed from ions with charges +1 and -1.

4. **Size of the Ions**:
- Lattice energy is inversely proportional to the distance between the ions (inter-nuclear distance). Smaller ions can get closer together, leading to a stronger electrostatic attraction and thus higher lattice energy. Conversely, larger ions will have a greater distance between them, resulting in lower lattice energy.

5. **Conclusion**:
- Therefore, the lattice energy of an ionic compound depends on both the charge of the ions and the size of the ions. The correct answer is that it depends on both factors.

### Final Answer:
The lattice energy of an ionic compound depends on both the charge and the size of the ions.

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