Average atomic weight: 30.973761998(5) u
| Isotope | Fraction | Atomic weight/u |
| 31 | 1(0) | 30.97376199842(70) |
Atomic weights and isotopic compositions were obtained from NIST Database 144
P I (P -like): 284 levels, 9733 lines (E1: 7035 IC: 2679 M1: 9 E2: 10), transition probabilities for 572 lines
P II (Si-like): 160 levels, 2370 lines (E1: 1728 IC: 625 M1: 5 E2: 7 M2: 5), transition probabilities for 318 lines
P III (Al-like): 120 levels, 1766 lines (E1: 912 IC: 846 M1: 3 E2: 4 M2: 1), transition probabilities for 107 lines
P IV (Mg-like): 208 levels, 4375 lines (E1: 2823 IC: 1547 M1: 2 E2: 2 M2: 1), transition probabilities for 243 lines
P V (Na-like): 67 levels, 554 lines (E1: 554), transition probabilities for 554 lines
P VI (Ne-like): 53 levels, 374 lines (E1: 317 IC: 53 M1: 2 E2: 1 M2: 1), transition probabilities for 114 lines
P VII (F -like): 38 levels, 109 lines (E1: 91 IC: 16 M1: 1 E2: 1), transition probabilities for 40 lines
P VIII (O -like): 57 levels, 186 lines (E1: 90 IC: 84 M1: 5 E2: 7), transition probabilities for 135 lines
P IX (N -like): 41 levels, 289 lines (E1: 132 IC: 138 M1: 9 E2: 10), transition probabilities for 198 lines
P X (C -like): 52 levels, 346 lines (E1: 199 IC: 135 M1: 5 E2: 7), transition probabilities for 151 lines
P XI (B -like): 44 levels, 197 lines (E1: 183 IC: 10 M1: 3 E2: 1), transition probabilities for 20 lines
P XII (Be-like): 53 levels, 462 lines (E1: 257 IC: 200 M1: 2 E2: 2 M2: 1), transition probabilities for 92 lines
P XIII (Li-like): 34 levels, 210 lines (E1: 153 IC: 57), transition probabilities for 56 lines
P XIV (He-like): 105 levels, 1342 lines (E1: 859 IC: 483), transition probabilities for 693 lines
P XV (H -like): 225 levels, 3056 lines (E1: 3056), transition probabilities for 3056 lines
(Atomic Line List v3.00b5)
