First slide
Transition elements

Though the outer electronic configuration is same for the elements in 1B or 11th group Cu, Ag, & Au, gold and silver are less reactive than copper because 


Enthalpies of atomization of Cu = 339, Ag = 285, and Au = 368 kJ/mol. I1 of Cu, Ag and Au are 7.726, 7.576 and 9.225 respectively.

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