How many moles of nickel (ni) atoms are in 125 g ni?

The solution to the problem is as follows:

125/58.69 = 2.12 mol 

Therefore, there are 2.12 moles of nickel (Ni) atoms are in 125 g Ni.

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The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.