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Assign reason for each of the following ...

Assign reason for each of the following statement:
(i) The largest number of oxidation states are exhibited by the elements in their row transition elements.
(ii) The atomic radii decrease in Size with the increasing atomic number in the lanthanoid series

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(i) The maximum number of oxidation states are shown by that element in a transition series which has maximum number of unpaired electrons. This is so in the middle of the series.
(ii) Refer to pase ( cause of lanthanoid contraction)
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PRADEEP-D- AND F-BLOCK ELEMENTS-CONCEPTUAL QUESTIONS
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