Why do transition elements shows variable oxidation states?

Why do transition elements show variable oxidation state?

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

(a) Describe the general trends in the following properties of the first series of the transition elements: (i) Stability of +2 oxidation state (ii) Formation of oxometal ions (b) Assign reason for each of the following: (i) Transition elements exhibit variable oxidation states. (ii)Transition metal ions are usually coloured

Give reason: (i) Transition metals show variable oxidation states. (ii) Actinoids show wide range of oxidation states.

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.

Explain the following (a) Zr and Hf exhibit similar properties. (b) Most of the transition elements show large number of oxidation states.

Assign reasons for each of the following (i) Trasitiono elements exhibit variable oxidation sates. (ii) Transition metal ions are usually coloured.

Why do alkali metals not show variable oxidation states ?

Which transition element does not exhibit variable oxidation state?

Which transition elements exhibit +8 oxidation state