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Transition metals tend to be unreactive ...

Transition metals tend to be unreactive with increasing atomic numbers in a series. Why ?

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This is because of gradual increase in the values of ionisation enthalpies which make the participation of electrons rather difficult.
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
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  12. What may the possible oxidation state of transition metals with the fo...

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  13. Discuss the relative stability in aqueous solution of +2 oxidation sta...

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