Question

The (n-1)d shell of electron in d-block elements is expanding and, therefore they have many physical and chemical properties in common. They show variable oxidation state and all are metals. The transition element i.e., d-block element show an unparallel tendency to form coordination compound with thhose groups which are able to donate an electron pair (i.e. lewis base).
Which of the following statement is incorrect?
A. Across a period from Sc to Cu the densities increase with increasing atomic number.
B. The melting point of transition elements rise to a maximum from Sc to Cr and then decreases from Fe to Zn.
C. Transition elements have high entahlpies of atomization and in 3d series regularly from Sc to Cu.
D. On going down a group from 3d to 6d series the stability of higher oxidation state increases with increasing atomic number.

Answer 1

Correct Answer - C
(A), (B) and (D) All are correct statements.
There is drope in enthalpy of atomization at manganese because of half filled stable electronic configurtion leading to less mobilisation of electrons. This results in weaker metalic bonds.