Block D and F Elements Class 12th Chemistry Ncert Solutions Chemistry Class 12th

8.42 Name the members of the lanthanoid series which exhibit +4 oxidation states and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configurations of these elements.

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Payal Gupta | Contributor-Level 10

8 months ago

8.42 The members of lanthanide series along with their electronic configuration are given in the below table:

Name	Symbol	Atomic number	Electron configuration
lanthanum	La	57	(Xe)5d¹ 6s²
Cerium	Ce	58	(Xe)4f¹5d⁰6s²
Praseodymium	Pr	59	(Xe)4f³5d⁰6s²
Neodymium	Nd	60	(Xe)4f⁴5d⁰6s²
Promethium	Pm	61	(Xe)4f⁵5d⁰6s²
Samarium	Sm	62	(Xe)4f⁶5d⁰6s²

Europium	Eu	63	(Xe)4f⁷5d⁰6s²
Gadolinium	Gd	64	(Xe)4f⁷ 5d¹6s²
Terbium	Tb	65	(Xe)4f⁹5d⁰6s²
Dysprosium	Dy	66	(Xe)4f¹⁰5d⁰6s²
Holmium	Ho	67	(Xe)4f¹¹5d⁰6s²
Erbium	Er	68	(Xe)4f¹²5d⁰6s²
Thulium	Tm	69	(Xe)4f¹³5d⁰6s²
Ytterbium	Yb	70	(Xe)4f¹⁴5d⁰6s²
Lutetium	Lu	71	(Xe)4f¹⁴ 5d¹6s²

The typical oxidation state of the lanthanides is +3. The oxidation state of +2 and +4 are exhibited by some of the elements. These are shown by those elements which by losing 2 or 4 elements

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Chemistry Ncert Solutions Class 12th 2023

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