Why do Zr and Hf exhibit similar properties ?

Why Zr and Hf exhibit similar properties ?

Write consequences of Lanthanoid contraction. Why Zr and Hf exhibit siumilar properties ?

Explain the following: (a) Europium (II) is more stable than cerium (II) (b) Zr and Hf exhibit similar properties. ( c) Scandium forms no coloured ions, yet it is regarded as a transition metal.

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

(a) Why do Zr and Hf have similar properties? (b) What happens when K_2Cr_2O_7 is treated with H_2SO_4 and NaCl solution ? (c) Why do transition metals form alloys easily?

Give reason 'Zr and Hf' exhibits similar properties.