What happens when a crystal potassium nitrate is added to a saturated solution as it cooled

Crystals will begin to form. crystals form from certain molecules in the liquid gather together as they attempt to become stable. they do this in a uniform and repeating pattern that forms the crystal.in nature, crystals can form when liquid rock, called magma, cools.if it cools slowly then crystals mayform.  hope it helps :)

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.