Which will from more stable ionic bond (i) Na and Cl (ii) Ca and Cl ?

Answer

To determine which ionic bond is more stable between NaCl and CaCl2, we can analyze the factors that affect the stability of ionic bonds, which are primarily the charges of the ions and their sizes.

### Step-by-Step Solution:

1. **Identify the Ions and Their Charges:**
- Sodium (Na) forms a cation with a charge of +1.
- Chlorine (Cl) forms an anion with a charge of -1.
- Calcium (Ca) forms a cation with a charge of +2.
- Chlorine (Cl) again forms an anion with a charge of -1.

2. **Write the Formulas:**
- The ionic compound formed from sodium and chlorine is NaCl.
- The ionic compound formed from calcium and chlorine is CaCl2 (since two Cl ions are needed to balance the +2 charge of Ca).

3. **Analyze the Charges:**
- In NaCl, the total charge is +1 (from Na) and -1 (from Cl), resulting in a net charge of 0.
- In CaCl2, the total charge is +2 (from Ca) and -2 (from two Cl ions), also resulting in a net charge of 0.

4. **Consider the Charge Magnitude:**
- The charge on Na is +1, while the charge on Ca is +2.
- The greater the charge on the ions, the stronger the electrostatic attraction between them. Therefore, CaCl2 has a higher charge magnitude compared to NaCl.

5. **Consider the Size of the Ions:**
- Sodium ions (Na⁺) are smaller than calcium ions (Ca²⁺), but the size of the anions (Cl⁻) remains the same in both compounds.
- The stability of ionic bonds is inversely proportional to the size of the ions. However, the effect of charge magnitude is more significant in this case.

6. **Conclusion:**
- Since CaCl2 has a higher charge (+2 from Ca compared to +1 from Na), it will form a more stable ionic bond than NaCl.

### Final Answer:
CaCl2 will form a more stable ionic bond than NaCl.