Which of the following values are not equal to 1 mole 12.0 g of carbon
16.0 g of oxygen
1.0 g of hydrogen
20.0 g of nitrogen

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.