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  4. Gadolinium has a low value of third ionisation enthalpy because of

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Q. Gadolinium has a low value of third ionisation enthalpy because of

NEETNEET 2022The d-and f-Block Elements

Solution:

${ }_{64} Gd =[ Xe ] 6 s ^{2} 4 f ^{7} 5 d ^{1} $
$Gd ^{+2} =[ Xe ] 4 f ^{7} 5 d ^{1}$
After losing $5 d$ electron $4 f$ has maximum exchange energy so Gd has low value of Third Ionisation energy