Atomic number: 12 Symbol: Mg
Average atomic weight: 24.3050(6) u
| Isotope | Fraction | Atomic weight/u |
| 24 | 0.7899(4) | 23.985041700(14) |
| 25 | 0.1000(1) | 24.98583692(3) |
| 26 | 0.1101(3) | 25.982592929(30) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
Mg II (Na-like): 104 levels, 1058 lines (E1: 1057 IC: 1), transition probabilities for 710 lines
Mg III (Ne-like): 111 levels, 1358 lines (E1: 1216 IC: 138 M1: 2 E2: 1 M2: 1), transition probabilities for 114 lines
Mg IV (F -like): 149 levels, 2181 lines (E1: 1594 IC: 586 M1: 1), transition probabilities for 844 lines
Mg V (O -like): 75 levels, 662 lines (E1: 431 IC: 222 M1: 5 E2: 4), transition probabilities for 424 lines
Mg VI (N -like): 110 levels, 1806 lines (E1: 816 IC: 981 M1: 5 E2: 4), transition probabilities for 952 lines
Mg VII (C -like): 85 levels, 722 lines (E1: 421 IC: 292 M1: 5 E2: 4), transition probabilities for 518 lines
Mg VIII (B -like): 102 levels, 973 lines (E1: 931 IC: 40 M1: 1 E2: 1), transition probabilities for 901 lines
Mg IX (Be-like): 86 levels, 1372 lines (E1: 707 IC: 661 M1: 2 E2: 1 M2: 1), transition probabilities for 500 lines
Mg X (Li-like): 57 levels, 586 lines (E1: 476 IC: 110), transition probabilities for 197 lines
Mg XI (He-like): 68 levels, 581 lines (E1: 345 IC: 235 M2: 1), transition probabilities for 246 lines
Mg XII (H -like): 225 levels, 3028 lines (E1: 3028), transition probabilities for 3028 lines
(Atomic Line List 2.05b16, compiled on Jan 13, 2012)