Chlorine 37 can be represented as

Chlorine 37 can be represented as 37 17 Cl. Hoped I helped. :)

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

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.