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the elements of 2 nd and 3 rd series have greater enthalpies of atomisation than the corresponding elenents of 1 st series. why?

the elements of 2nd and 3rd series have greater enthalpies of atomisation than the corresponding elenents of 1st series. why?

Grade:12

1 Answers

Ravleen Kaur
askIITians Faculty 1452 Points
4 years ago
In first transition series, electrons are filled only in d orbitals but in second and third transition series, electrons are filled in d- and f-orbitals. The screening effect of f-orbital is lower than that of d-orbital. So nuclear charge experienced by valence electrons in second and third transition series is more than that of the first transition series. Therefore, force of attraction between nucleus and electrons is more. Due to this enthalpy of atomization of second and third transition series elements are more than first transition series elements.

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