Question:
The second ionization enthalpy of which of the following alkaline earth metals is the highest?
The second ionization enthalpy of which of the following alkaline earth metals is the highest?
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Ionization energy decreases down the group due to increase in atomic size.
Updated On: May 2, 2026
- Ba
- Mg
- Ca
- Sr
- Be
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The Correct Option is
Solution and Explanation
Concept:
Second ionization enthalpy = removal of electron from M$^+$ ion
Step 1: Electronic configuration \[ \text{Be: } 1s^2 2s^2 \] After first ionization: \[ \text{Be}^+ = 1s^2 2s^1 \]
Step 2: Reasoning
• Small size → strong nuclear attraction
• Removing second electron is very difficult
• Across group: size increases → ionization energy decreases Thus highest value for Be
Step 1: Electronic configuration \[ \text{Be: } 1s^2 2s^2 \] After first ionization: \[ \text{Be}^+ = 1s^2 2s^1 \]
Step 2: Reasoning
• Small size → strong nuclear attraction
• Removing second electron is very difficult
• Across group: size increases → ionization energy decreases Thus highest value for Be
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