It contains three quarks (up (u) or down (d))  with total spin J = 1/2 and total isospin I = 1/2. In the quark model it is considered to be a radially excited three-quark state with radial quantum number N = 2 and positive parity.
This consists of three quarks (up (u) or down (d)) with total spin J = 1/2 and total isospin I = 1/2. In the quark model, it is considered a radially excited three-quark state with radial quantum number N = 2 and positive parity.