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Atomic radii of , and vary

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Important Questions on d- and f-Block elements
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Read the following statements and choose the correct option.
(i) -block elements of period are called lanthanoids.
(ii) -block elements of period are called actinoids.

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Given below are two statements :
Statement I : The value of is
Statement II : Ce is more stable in state than state.
In the light of the above statements, choose the most appropriate answer from the options given below:

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