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what is 3d,4d,5d transition series ?
First transition series known as 3d series consists of ten elements from Sc (at .no.21) to
Zn (at.no.30 ) lies in the 4th period .

Second transition series known as 4d series consists of ten elements from Y(at.no.39) to
 Cd(at.no.48) lies in the 5th period .

Third transition series known as La (at.no.57)and from Hf (at.no.72) to Hg(at.no.80)consists of ten elements lies in the 6th period .

 Properties of the elements in the d-block series . The elements in the d-series have similar properties .This is because of the characteristic electronic configuration of the transition elements .The electronic configuration differ one another only in the number of electrons in the d orbitals .


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