Which of the following statement is incorrect?

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Across a period from Sc to Cu the densities increase with increasing atomic number.

The melting point of transition elements rise to a maximum from Sc to Cr and then decreases from Fe to Zn.

Transition elements have high enthalpies of atomization and in 3d series increase regularly from Sc to Cu.

On going down a group from 3d to 6d series the stability of higher oxidation state increases with increasing atomic number.

answer is C.

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Detailed Solution

Enthalpy of atomization depends on the number of unpaired electrons. More is the unpaired electrons, more is the enthalpy of atomization. Initially, enthalpy of atomization of 3d elements increases because of increasing of unpaired electrons but after a while, when pairing starts, then enthalpy decreases. This concludes that the enthalpy of atomization of 3d elements first increases then decreases.

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