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  4. The reactivity of the transition element usually decreases from Sc to Cu because of

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Q. The reactivity of the transition element usually decreases from Sc to Cu because of

UPSEEUPSEE 2018

Solution:

The reactivity of the transition element usually decreases from Sc to Cu because of continuous increase in ionisation enthalpy. In $3 d$ series, the ionisation energy increases form left to right but the increase is not pronounced as in the case of s-and p-block elements. This is due to the greater effective nuclear charge acting on outer valence electrons because of the weak shielding of the nucleus by 4 f-electrons.