How would you account for the following: i. Many of the transition elements and their compounds can act as good cataly

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Q 2641691523.     How would you account for the following:
i. Many of the transition elements and their compounds can act as good catalysts.
ii. The metallic radii of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second series.
iii. There is a greater range of oxidation states among the actinoids than among the lanthanoids.
CBSE-12th 2009

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