1.

Compare the ionizationenthalpies of firstseriesof the transitionelements.

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Solution :(I ) Ionizationenergyof transitionelementis intermediatebetweenthoseof aandp blockelements.Aswe movefromleftto rightin atransitionicreasesas EXPECTED . Thisis due to increase in nuclearchargecorrespondingto the fillingof d electrons.Thefollowingfigureshow thetrendsinionisationenthalpyof transtionelements .
(ii) The firstionisation energyof 5dseriesofelementare muchhigherthat those of3dand 4dseriesof elements .
(III)The added electronenters(n-1)orbitaland theinnerelectronsact asshieldand decreasethe effectof nuclearchargeon VALENCE nselectrons.
(IV)therefore it leads tovariation in theionization energyvalues.


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