If u take epsom salt and water leave it for a day what forms overnight

a. b.
crystals rocks

A: salt crystals because that is the only variable in this equation, also you can't make rocks because salt cant make rocks.

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.