D-Block and F-Block Elements

The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".
Many scientists describe a "transition metal" as any element in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table. In actual practice, the f-block lanthanide and actinide series are also considered transition metals and are called "inner transition metals". Check on the video lectures below to help understand the concepts better:

 

 

Etoos Education

 

 

CBSE India

 

 

 

Vedantu JEE

 

 

 

 Nucleon

 
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