A student adds 1 L of water to 1 mol of sodium chloride. Will the result be a 1 M solution of sodium
chloride and water? Why or why not?

The mass has escaped into a gas which you can not see so the law stays true.

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.

Bis the