(Solved): : (a) Why do transition elements show variable oxidation states? 1. Name the elements showing a max ...

: (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 \( \mathrm{Sc}(\mathrm{Z}=21) \) to \( \mathrm{Zn}(\mathrm{Z}=30) \) 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