Zn, Cd, Hg are d-block elements but not transition elements because

Account for the following: (i) Copper (I) compounds are white whereas Copper (II) compounds are coloured. (ii) Transition metals and their compounds show catalytic activities. (iii) Zn,Cd,Hg are considered as d-block elements but not as transition elements (iv) Transition metals and many of their compounds show paramagnetic behaviour. (v) Transition metals can form alloy.

All transition elements are d-block elements, but all d-block elements are not transition elements. Which the following is true.

Which block elements are called transition elements ?

Introduction of d-block elements: - position in periodic table| Trick to learn d-block elements and d-block elements vs transition elements

(a) What are transition elements ? Which of the d-block elements are not regarded as transition elements ? (b) In what way the electronic configurations of transition elements are different from those of representative elements ?

(a) Define transition elements. (b) Give general electronic configuration of f-block elements.(c ) Most of transition elements are coloured, why? (d ) Transition elements show variable oxidation states, why?