Give classification of d-block and f-block elements

1.	Give classification of d-block and f-block elements
Answer» Solution :The d-block elements are classified on the basis of the electrons that get filled in d-orbitals. These elements are classified in to four series: (i) `I^(ST)` series (3 d-series) `rArr ""_(21)Sc" to " ""_(30)Zn` (ii) `II^(nd)` series (4 d-series) `rArr ""_(39)Y" to " ""_(48)Cd` (iii) `III^(rd)` series (5 d-series) `rArr ""_(57)La" to " ""_(72)Hf " to " ""_(80)Hg` (iv) `IV^(th)` series (6 d-series) `rArr ""_(89)Ac" to " ""_(104)Rf " to """_(112)Cn` Each series has 10 elements present, and hence in all there are 40 elements in TOTAL that belongs to a d-block. The f-block elements are categorized in two series on the basis of electrons that get filled in f-orbitals: (i) Lanthanoide series `[""_(58)Ce " to " ""_(71)Lu]`: These elements have similar physical and chemical properties as of Lanthanum. Hence, these elements are called lanthanoids. It is called 4f series (i) Actinoide series `[""_(90)Th " to" ""_(103)Lr]`: These elements have similar physical and chemical properties as of actinoid. Hence, these elements are called actinoids. It is called 5f series. In each series of f-block, there are 14 elements. Hence in all there are 28 elements present in f-block

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