Hi all, 1. The problem statement, all variables and given/known data In this question consider the nucleus 15N (The 15 is the atomic mass, so superscript top left of N), and refer to the shell model diagram. (a) Predict the ground state spin and parity, Jpi. (b) Write out the relevant odd particle configuration in the form: p (or n): (nlj)a (n'lj')a'... where (nlj) denotes the sub-shell and a the occupancy. 2. Relevant equations 3. The attempt at a solution (a) Well from what I know there will be 7 protons, hence 1s will be filled, and 1p will have 5 out of 6 spaces filled. Do the positive spins get filled first? If so then it's a negative spin? Not sure about this parity thing... Wikipedia has an article that says both 1s and 1p filled gives odd parity, so does this mean that 7 protons is even? (b) (1slj)2 (1plj)7 ??