(a) From element to element actinoid contraction is greater than lanthanoid contraction because the 5f electrons provide very poor shielding effect.
(b) Fe has higher melting point than Cu. Since, the melting point depends on the no. of metallic bonds which are formed by the unpaired electrons of the metal atoms. As Fe has more no. of unpaired electrons as compared to Cu thus its melting point will also be high.
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