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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?

Vasu Saxena , 7 Years ago
Grade 12
anser 1 Answers
Vikas TU

Last Activity: 7 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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