Which of the following has highest second ionisation energy?
Show Hint
- Chromium
- Calcium
- Iron
- Cobalt
The Correct Option is A
Solution and Explanation
Second IE is energy to remove electron from M\(^+\).
Step 2: Detailed Explanation:
Cr: [Ar]3d\(^5\)4s\(^1\) \(\rightarrow\) Cr\(^+\): [Ar]3d\(^5\) (half-filled stable)
Removing another electron requires high energy.
Step 3: Final Answer:
Chromium has highest second IE.
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