Choose the correct statements (s).

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Ions of the same charge in a given transition series show progressive decrease in radius with increasing atomic number.

Same trend as (a) is observed in the atomic radii

There is occurrence of much more frequent metal-metal bonding in compounds of heavy transition metals

Metals of 2nd and 3rd transition series have greater enthalpies of atomization than the corresponding elements of first series.

answer is A.

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Detailed Solution

With rising atomic number, ions with the same charge in a sequence of transition elements exhibit a steady reduction in radius. Each time a new electron joins a d orbital, the nuclear charge rises by a single unit.

This is due to the fact that when atomic number decreases within a group, the atomic radius—the separation between the valence electrons and nucleus—increases.

In complexes of heavy transition metals, metal-metal bonding occurs substantially more often.

Due to the existence of D and F electrons, second and third series metals have higher enthalpies of atomization than the first transition series. Only D electrons are present in the first transition series. While D and F electrons are present in the second and third transition series.

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