Question

In which block will copper be placed of the aufbau principle is not followed and the feeling of electron take place in the following sequence -1s,2s,3s,3p,3d,4s,4d,4f.
a)s. b)p. c)d. d)f

Answer 1

Answer:

1. options c is correct .i

Answer 2

Answer:

correct answer is a) s.