Observe the set of quantum numbers. I dentify which of these sets are valid and invalid. Justify your answers for illegitimate or invalid sets.

1. n=1, l=0, ml=0, ms=1/2

2. n=1 l=2 ml=-3, ms=1/2

3. n=2, l=2, ml=-2, s=1/2

4. n=3, l=0, ml=-0, s=-1/2