Which one of the following statements about atomic structure and quantum numbers is incorrect?  a. In a given atom, the maximum number of electrons having principal quantum number n = 3, is 18. b. For n = 4, the largest possible value of ml is 2. c. For n = 4, the largest possible value of l is 3. d. The following set of quantum numbers for a single orbital is not allowed: n = 3, l = 1, ml = -2. e. The number of orbitals in a given f subshell is 7.

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