$^{16}$O is a closed proton and neutron shell. The seventeenth nucleon in $^{17}$O is an unpaired neutron in the $1d_{5/2}$ orbital. Its orbital angular momentum is l = 2, coupled with spin 1/2 to the lower-energy j = 5/2 shell-model state. The closed core contributes zero, so ground-state j is 5/2, D.
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