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Compare the chemistry of the actinoids with that of lanthanoids with reference to the following:

(a) electronic configurations, 

(b) oxidation states, 

(c) chemical reactivity

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Comparison between chemistry of Actinoids Lanthanoids

S.No Characteristics Actinoids Lanthanoids
(a) Elctronic configuration [RN] 5f1-14 6d0-1 7s2 [Xe] 4f1-14 5d0-1 6s2
(b) Chemical reactivity  These are highly reactive metals. These are less reactive metals.
(c) Oxidation states Besides +3 O.S. actinoids show higher O.S. of +4, +5, +6, +7 also because of smaller energy gap between 5f, 6d and 7s subshell. Besides +3 O.S. Lanthanoids show +2 and +3 O.S. only in a few cases + 4.

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