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Choice C. First number represents shell. Second represents subshelll s is 0 p is 1 d is 2, and so forth. Third represents the specific orbital and is a value between the negative and the positive value of the second number. if secod number is 2, third could be -2, -1, 0, 1, 2, representing the five d orbitals. Fourth number is either +(1/2) or -(1/2), simply indicating the spin direction of one of the two possible electrons in the orbital.