How would you account for the following?
(l) Transition metals exhibit variable oxidation states.
(ii) Zr (Z = 40) and Hf (Z = 72) have almost identical radii.
(iii) Transition metals and their compounds act as catalyst.

How would you account for the following? (a) Transition metals exhibit variable oxidation states. (b) Zr(Z = 40) and Hf (Z = 72) have almost identical radii.

How would you account for the following? (i) Transition metals exhibits variable oxidation state. (ii) Zr(Z=40) and Hf(Z=72) have almost identical radii. (iii) Transition metals and their compounds act as catalyst. OR Complete the following chemical equation: (i) Cr_(2)O_(7)^(2-)+6Fe^(2+)+14H^(+)rarr (ii) CrO_(4)^(2-)+2H^(+)rarr (iii) 2MnO_(4)^(2-)+5C_(2)O_(4)^(2-)+16H^(+)rarr

Transition metals exhibit variable oxidation states. It is because of

How would you account for the following? The transition metal compounds are good catalyst.

Give reasons : (i) Actinoids show variable oxidation states. (ii) Zr and Hf have almost identical radii.

Why do Zr(Z = 40) and Hf(Z = 72) have comparable atomic radii ?