What does the salinity of sea water represent? the concentration of salt dissolved in the ocean the concentration of all dissolved chemicals in the ocean the volume of salt in the ocean the mass of salt in the ocean

The correct answer is c

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.