A) Fe
B) Co
C) Au
D) Cu
Correct Answer: C
Solution :
Key Idea Transition elements consists of three complete series of 10 elements and one incomplete series. These series are following (i) 3d-transition series scandium \[(Z=21)\] to zinc \[(Z=30)\] (ii) 4d-transition series yttrium \[(Z=39)\] to cadmium \[(Z=48)\] (iii) Sd-transition series lanthanum \[(Z=57)\], hafnium \[(Z=72)\] to mercury \[(Z=80)\] (iv) 6d-transition series This series starts from actinium \[(Z=89)\] and is incomplete. It will include elements from atomic number 104 onwards. Fe(26), Co(27) and Cu(29) are the element of 3d-transition series while Au(79) is the element of Sd-transition series.
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