Transition series What is transition series d block elements

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Transition series:

There are four transition series -

1- First transition series contain 10 elements from scandium (at.no.21) to Zinc (at.no.30). They have incompletely 3d orbitals.

2- Second transition series contain 10 elements , from Yttrium (at.no.39) to cadmium (at .no . 48 ) they have incomplete 4d - orbitals .

3- Third transition series include 10 elements with incomplete 5 d - orbitals . These are Lanthanum (at . no . 80) .

4- Fourth transition series . This series is not complete and has incompletely filled f - electrons . This consist of lanthanides and actinides are identified below under f - block elements.

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