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The d-And-f-Block Elements
Question
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Give Possible reason for the fact that the radii of Mn2+ ions of the first row transition metals. Ti2+ (Z = 22) to Cu2+ (Z = 29) decrease with increasing atomic number.

Answer

The radii M2+ ions decrease from Ti2+ Cu2+. This is due to the following reasons:
(i) The nuclear charge increases in going from Ti to Cu.
(ii) The added electrons enter the same inner 3d orbitals. The net effect of these factors is a greater inward pull on the electron shell and therefore reduction in size.

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