spin238Spin; 238 U: 4.468(6) × 10 9 a: 0+ Isotones and Isobars The following table shows the atomic nuclei that are isotonic (same neutron number N = 146) and isobaric (same nucleon number A = 238)Spin; 238 Np: 2.099(2) d: 2+ Isotones and Isobars The following table shows the atomic nuclei that are isotonic (same neutron number N = 145) and isobaric (same nucleon number A = 238) with