An atom has an electron configuration of 1s22s22p6. Which of the following are possible quantum states of the electrons in the atom? 1. (2,0, 1, +1/2) II. (2, 1,-1,-1/2) III. (2, 1, 0, +1/2) IV. (1, 0, 0, -1/2) a. I and II only. b. I, II, and III only. c. II, III, and IV only. d. II and III only.

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