An orbital has n=4 &ml=-1 what are the possible value of l for this orbital

Answer 1

Since ml = -1, the possible values for l would be any value of 1 or greater.

The -1 value for ml indicates that the orbital is p, d, f, or any other but NOT an s orbital. That being the case, the value of l can be anything such that ml is -l to +l, meaning it can be 1 or greater.