The number of  orbitals associated with quantum numbers n=5,ms=+12is

n=5⇒possible  orbitals=n2=25⇒there can be 25 electrons with n=5, ms=+12 orIn other words the possible orbitals are 5s 5p,5d,5f,5g each would contribute to 1,3,5,7,9, totally 25 orbitals.