Question:
The correct order of first ionisation enthalpies of the following elements is
The correct order of first ionisation enthalpies of the following elements is
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Down a group → ionization energy decreases.
Updated On: May 8, 2026
- Be > Mg > Ca > Sr > Ra > Ba
- Ra > Ba > Sr > Ca > Mg > Be
- Be > Mg > Ca > Sr > Ba > Ra
- Ra > Sr > Ba > Mg > Ca > Be
- Be > Mg > Ca > Ra > Ba > Sr
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The Correct Option is C
Solution and Explanation
Concept:
Ionization energy decreases down the group due to:
• Increase in atomic size
• Increase in shielding effect
Step 1: Identify group.
All elements belong to Group 2.
Step 2: Trend down the group. \[ \text{IE decreases: Be > Mg > Ca > Sr > Ba > Ra} \]
Step 3: Check options. Option (C) matches the trend.
Step 4: Final answer. \[ \boxed{(C)} \]
• Increase in atomic size
• Increase in shielding effect
Step 1: Identify group.
All elements belong to Group 2.
Step 2: Trend down the group. \[ \text{IE decreases: Be > Mg > Ca > Sr > Ba > Ra} \]
Step 3: Check options. Option (C) matches the trend.
Step 4: Final answer. \[ \boxed{(C)} \]
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