Average atomic weight: 79.901–79.907 u
| Isotope | Fraction | Atomic weight/u |
| 79 | 0.5069(7) | 78.9183376(14) |
| 81 | 0.4931(7) | 80.9162897(14) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
Br I (Br-like): 251 levels, 8050 lines (E1: 5532 IC: 2513 M1: 3 E2: 1 M2: 1), transition probabilities for 4 lines
Br II (Se-like): 121 levels, 2085 lines (E1: 856 IC: 1219 M1: 5 E2: 4 M2: 1), transition probabilities for 2 lines
Br III (As-like): 30 levels, 178 lines (E1: 83 IC: 85 M1: 6 E2: 4), transition probabilities for 2 lines
Br IV (Ge-like): 40 levels, 242 lines (E1: 135 IC: 100 M1: 4 E2: 2 M2: 1), transition probabilities for 2 lines
Br V (Ga-like): 9 levels, 13 lines (E1: 12 M1: 1), transition probabilities for 1 lines
Br VI (Zn-like): 11 levels, 23 lines (E1: 13 IC: 6 M1: 2 E2: 1 M2: 1), transition probabilities for 2 lines
Br VII (Cu-like): 5 levels, 5 lines (E1: 5), transition probabilities for 0 lines
Br VIII (Ni-like): 11 levels, 10 lines (E1: 4 IC: 6), transition probabilities for 0 lines
Br IX (Co-like): 4 levels, 3 lines (E1: 3), transition probabilities for 0 lines
Br X (Fe-like): 1 levels, 0 lines
Br XI (Mn-like): 1 levels, 0 lines
Br XII (Cr-like): 1 levels, 0 lines
Br XIII (V -like): 1 levels, 0 lines
Br XIV (Ti-like): 1 levels, 0 lines
Br XV (Sc-like): 1 levels, 0 lines
Br XVI (Ca-like): 3 levels, 1 lines (E1: 1), transition probabilities for 0 lines
Br XVII (K -like): 1 levels, 0 lines
Br XVIII (Ar-like): 1 levels, 0 lines
Br XIX (Cl-like): 6 levels, 5 lines (E1: 3 M1: 1 M2: 1), transition probabilities for 1 lines
Br XX (S -like): 2 levels, 1 lines (M1: 1), transition probabilities for 0 lines
Br XXI (P -like): 1 levels, 0 lines
Br XXII (Si-like): 2 levels, 1 lines (E2: 1), transition probabilities for 0 lines
Br XXIII (Al-like): 1 levels, 0 lines
Br XXIV (Mg-like): 12 levels, 9 lines (E1: 5 M1: 2 E2: 2), transition probabilities for 4 lines
Br XXV (Na-like): 18 levels, 25 lines (E1: 25), transition probabilities for 25 lines
Br XXVI (Ne-like): 18 levels, 17 lines (E1: 15 IC: 2), transition probabilities for 0 lines
Br XXVII (F -like): 53 levels, 85 lines (E1: 57 IC: 27 M1: 1), transition probabilities for 1 lines
Br XXVIII (O -like): 37 levels, 112 lines (E1: 55 IC: 48 M1: 5 E2: 4), transition probabilities for 2 lines
Br XXIX (N -like): 1 levels, 0 lines
Br XXX (C -like): 1 levels, 0 lines
Br XXXI (B -like): 2 levels, 1 lines (M1: 1), transition probabilities for 1 lines
Br XXXII (Be-like): 4 levels, 3 lines (E1: 1 IC: 2), transition probabilities for 0 lines
Br XXXIII (Li-like): 3 levels, 2 lines (E1: 2), transition probabilities for 2 lines
Br XXXIV (He-like): 25 levels, 101 lines (E1: 68 IC: 33), transition probabilities for 64 lines
Br XXXV (H -like): 100 levels, 920 lines (E1: 920), transition probabilities for 920 lines
(Atomic Line List v3.00b5)
