Name the members of the lanthanoid series ...

NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

Question : 32 of 49

Marks: +1, -0

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

Solution:

All lanthanoids show Ln

^{3+}

oxidation state. But some of them show+2 and +4 states also in solution and solid form like Ce

^{4+}

, Eu

^{2+}

, Yb

^{2+}

, Tb

^{4+}

,etc. The variable oxidation state is related to electronic configuration dueto extra stability of half filled, fully filled or empty orbitals. e.g., Ce

^{4+}

has4f

^{0}

, Eu

^{2+}

has 4f

^{7}

^{4+}

has 4f

^{7}

and Yb

^{2+}

has 4f

^{14}

configuration.

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NCERT Class XII Chemistry Chapter - The d- and f-Block Elements Questions with Solutions

NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions