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Generally enthalpies of atomization increases from left to right till the middle of transition series & then decreases. However in 3d & 4d series Mn and Tc show abnormally low value. Why?

Generally enthalpies of atomization increases from left to right till the middle of transition series & then decreases. However in 3d & 4d series Mn and Tc show abnormally low value. Why?

Grade:12

1 Answers

Vikas TU
14149 Points
5 years ago
Due to lanthanide contraction such abnormalities can  be seen.
This contraction leads to the updown and imbalance in 3d and 4d orbital series for d-block elements.
Therefore, the Enthalpies of atomization increases from left to right till the middle of transition series & then decreases. However in 3d & 4d series Mn and Tc show abnormally low value.

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