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According to modern definition elements having unpaired d are called transition elements but Gd,Th etc. have unpaired d then why dont we include them in transition elements group??

According to modern definition elements having unpaired d are called transition elements but Gd,Th etc. have unpaired d then why dont we include them in transition elements group??

Grade:12th pass

1 Answers

Vikas TU
14149 Points
4 years ago
Gadolinium has atomic number 64 on the periodic table. It occupies the central position in the lanthanide series of elements. Lanthanides are rare-earth metals grouped chemically because they possess partially filled inner shells of electrons (4f and 5d subshells). 
The electronic structure of the neutral Gd atom is shown right. Note the 7 unpaired electrons in its 4f subshell that account for the element's strong paramagnetism. In its ionized state, Gd+3 donates its 6s² and 5d¹ electrons for bonding, leaving its 4f7 electron shell intact. The powerful magnetic moment of Gd is therefore largely maintained even when chelated to a ligand such as DTPA in a contrast agent formulation.

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