Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Explanation

The give statement in true as explained below:
(a). Atomic radii of the heavier transition elements `(4d` and `5d` series) are larger than those of the corresponding elements of the first transition series though those of `4d` and `5d` series are very close to each other.
(b). Melting and boiling points of hevier transition elements are greater than those of the first transition series due to stronger entermetallic bonding.
(c). Enthalpies of atomisation of `4d` and `5d` series are higher than the corresponding elements of the rirst series.
(d). Inisation enthalpies of `5d` series are higher than the corresponding elements of `3d` and `4d` series.