Compared to 3d series the corresponding ...

Compared to 3d series the corresponding transition metals of 4d and 5d transition series show high enthalpy of atomization. Explain.

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Compared to 3d-series the corresponding transition metals of 4d and 5d transition series show high enthalpy of atomisation.
Reason : This is due to the occurrence of much more frequent metal-metal bonding in compounds of heavy transition metals.

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