Average atomic weight: 51.9961(6) u
| Isotope | Fraction | Atomic weight/u |
| 50 | 0.04345(13) | 49.94604183(94) |
| 52 | 0.83789(18) | 51.94050623(63) |
| 53 | 0.09501(17) | 52.94064815(62) |
| 54 | 0.02365(7) | 53.93887916(61) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
Cr I (Cr-like): 618 levels, 34159 lines (E1: 7842 IC: 26213 M1: 26 E2: 77 M2: 1), transition probabilities for 527 lines
Cr II (V -like): 913 levels, 74545 lines (E1: 29117 IC: 43551 M1: 440 E2: 1437), transition probabilities for 130 lines
Cr III (Ti-like): 352 levels, 14858 lines (E1: 4467 IC: 8842 M1: 334 E2: 1215), transition probabilities for 37 lines
Cr IV (Sc-like): 154 levels, 3053 lines (E1: 1087 IC: 1473 M1: 121 E2: 372), transition probabilities for 120 lines
Cr V (Ca-like): 46 levels, 321 lines (E1: 135 IC: 117 M1: 19 E2: 50), transition probabilities for 106 lines
Cr VI (K -like): 62 levels, 339 lines (E1: 303 IC: 33 M1: 1 E2: 2), transition probabilities for 153 lines
Cr VII (Ar-like): 65 levels, 552 lines (E1: 398 IC: 98 M1: 19 E2: 30 M2: 4 E3: 3), transition probabilities for 117 lines
Cr VIII (Cl-like): 22 levels, 37 lines (E1: 32 IC: 3 M1: 1 E2: 1), transition probabilities for 23 lines
Cr IX (S -like): 28 levels, 92 lines (E1: 42 IC: 38 M1: 5 E2: 7), transition probabilities for 48 lines
Cr X (P -like): 32 levels, 133 lines (E1: 68 IC: 48 M1: 9 E2: 8), transition probabilities for 102 lines
Cr XI (Si-like): 34 levels, 134 lines (E1: 60 IC: 62 M1: 5 E2: 7), transition probabilities for 69 lines
Cr XII (Al-like): 39 levels, 250 lines (E1: 144 IC: 98 M1: 3 E2: 4 M2: 1), transition probabilities for 200 lines
Cr XIII (Mg-like): 38 levels, 209 lines (E1: 122 IC: 82 M1: 2 E2: 2 M2: 1), transition probabilities for 179 lines
Cr XIV (Na-like): 50 levels, 399 lines (E1: 399), transition probabilities for 366 lines
Cr XV (Ne-like): 15 levels, 14 lines (E1: 6 IC: 7 M2: 1), transition probabilities for 8 lines
Cr XVI (F -like): 28 levels, 80 lines (E1: 56 IC: 22 M1: 1 E2: 1), transition probabilities for 20 lines
Cr XVII (O -like): 27 levels, 80 lines (E1: 37 IC: 32 M1: 5 E2: 6), transition probabilities for 43 lines
Cr XVIII (N -like): 17 levels, 69 lines (E1: 30 IC: 25 M1: 9 E2: 5), transition probabilities for 56 lines
Cr XIX (C -like): 20 levels, 87 lines (E1: 36 IC: 34 M1: 5 E2: 7 M2: 5), transition probabilities for 87 lines
Cr XX (B -like): 19 levels, 72 lines (E1: 42 IC: 24 M1: 3 E2: 2 M2: 1), transition probabilities for 33 lines
Cr XXI (Be-like): 26 levels, 112 lines (E1: 60 IC: 47 M1: 2 E2: 2 M2: 1), transition probabilities for 55 lines
Cr XXII (Li-like): 12 levels, 22 lines (E1: 22), transition probabilities for 22 lines
Cr XXIII (He-like): 25 levels, 102 lines (E1: 68 IC: 33 M1: 1), transition probabilities for 74 lines
Cr XXIV (H -like): 100 levels, 912 lines (E1: 912), transition probabilities for 912 lines
(Atomic Line List v3.00b5)
