Average atomic weight: 14.00643–14.00728 u
| Isotope | Fraction | Atomic weight/u |
| 14 | 0.99636(20) | 14.00307400443(20) |
| 15 | 0.00364(20) | 15.00010889888(64) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
N I (N -like): 366 levels, 13986 lines (E1: 8663 IC: 5308 M1: 7 E2: 8), transition probabilities for 3413 lines
N II (C -like): 411 levels, 20806 lines (E1: 8857 IC: 11932 M1: 5 E2: 7 M2: 5), transition probabilities for 2425 lines
N III (B -like): 330 levels, 15764 lines (E1: 6506 IC: 9246 M1: 3 E2: 4 M2: 5), transition probabilities for 2750 lines
N IV (Be-like): 287 levels, 7737 lines (E1: 7689 IC: 43 M1: 2 E2: 2 M2: 1), transition probabilities for 2576 lines
N V (Li-like): 223 levels, 2870 lines (E1: 2870), transition probabilities for 1647 lines
N VI (He-like): 99 levels, 881 lines (E1: 870 IC: 9 M1: 1 M2: 1), transition probabilities for 871 lines
N VII (H -like): 535 levels, 9632 lines (E1: 9632), transition probabilities for 9632 lines
(Atomic Line List v3.00b5)
