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NEET Chemistry
QUESTION #7394
Question 1
Four successive first-row transition elements are listed with their atomic numbers. Which is expected to have the highest third ionisation enthalpy?
Correct Answer Explanation
Third ionisation involves removing the 3rd electron.
Mn (Z=25): configuration [Ar] 3dāµ 4sĀ². After losing 2eā» ā [Ar] 3dāµ (half-filled, very stable). Removing the 3rd electron from a half-filled 3dāµ shell requires breaking extra stability ā very high energy needed.
Therefore, Mn has the highest third ionisation enthalpy among these elements.
Mn (Z=25): configuration [Ar] 3dāµ 4sĀ². After losing 2eā» ā [Ar] 3dāµ (half-filled, very stable). Removing the 3rd electron from a half-filled 3dāµ shell requires breaking extra stability ā very high energy needed.
Therefore, Mn has the highest third ionisation enthalpy among these elements.
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