Question:medium

The correct order of first ionisation enthalpies of the following elements is

Show Hint

Down a group → ionization energy decreases.
Updated On: Jul 5, 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
Show Solution

The Correct Option is C

Solution and Explanation

Understanding the 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. \[ \boxed{(C)} \]
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