Which of the following sets of quantum numbers are not allowed in the hydrogen atom?

Question

Which of the following sets of quantum numbers are not allowed in the hydrogen atom? For the sets of quantum numbers that are incorrect, indicate what is wrong in each set.

(a) n = 2, l = 1, ml = -1

--allowed

--not allowed, n is not valid

--not allowed, l is not valid

--not allowed, ml is not valid

(b) n = 1, l = 1, ml = 0

--allowed

--not allowed, n is not valid

--not allowed, l is not valid

--not allowed, ml is not valid

(c) n = 8, l = 7, ml = -6

--allowed

--not allowed, n is not valid

--not allowed, l is not valid

--not allowed, ml is not valid

(d) n = 1, l = 0, ml = 2

--allowed

--not allowed, n is not valid

--not allowed, l is not valid

--not allowed, ml is not valid

I don't really understand quantum numbers, so an explanation in addition to answers to all of these would be great. Thanks.

Answer 1

n=2,1=1,ml=-1