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: (a) Why do transition elements show variable oxidation states? 1. Name the elements showing a maximum number of oxidation states among the first series

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: (a) Why do transition elements show variable oxidation states? 1. Name the elements showing a maximum number of oxidation states among the first series of transition metals from Sc(Z=21) to Zn(Z=30) 2. Name the element which shows only +3 oxidation state (b) What is lanthanide contraction? Name an important alloy that contains some of the lanthanoid metals

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