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Cerium belongs to F- Block ( Lanthanide  series) in periodic table and  its atomic no. is 58 .

Electronic configuration is 4f ² 6s ² .

Ce+4 is less stable than Ce+3 hence in order to convert +4 oxidaion state to +3  Cerium +4 gains 1 electron and itself gets reduced .Hence the substance
which itself gets reduced acts as better oxidizing agent.

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