Why do transition elements show variable oxidation state?

(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?

Explain the following : (i) Most of the transition elements show variable oxidation states. (ii) Many transition elements and their compounds are paramagnetic .

Explain the following : (i) Most of the transition elements show variable oxidation states. (ii) Most of the compounds of transition elements are coloured. (iii) Many transition elements and their compounds are paramagnetic .

The transition elements exhibit variable oxidation states because_______________.

Explain the following properties of transition elements. (i) Variable oxidation states (ii) Complex formation

Give reason for the following : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows the highest oxidation state of +4 (ii) Transition metals show variable oxidation states. (iii) Actinoids show irregularities in their electronic configurations.