| Weight | Element | # of Neutrons |
| 1.007 | |
| 4.002 | |
| 6.941 | |
| 9.012 | |
| 10.811 | |
| 12.010 | |
| 14.006 | |
| 15.999 | |
| 18.998 | |
| 20.179 | |
| 22.989 | |
| 24.305 | |
| 26.981 | |
| 28.055 | |
| 30.973 | |
| 32.065 | |
| 35.453 | |
| 39.948 | |
| 39.098 | |
| 40.078 | |
| 44.955 | |
| 47.867 | |
| 50.941 | |
| 51.996 | |
| 54.938 | |
| 55.845 | |
| 58.693 | |
| 58.933 | |
| 63.546 | |
| 65.380 | |
| 69.723 | |
| 72.640 | |
| 74.921 | |
| 78.960 | |
| 79.900 | |
| 83.798 | |
| 85.467 | |
| 87.620 | |
| 88.905 | |
| | Weight | Element | # of Neutrons |
| 91.224 | |
| 92.906 | |
| 95.960 | |
| [98] | |
| 101.070 | |
| 102.905 | |
| 106.420 | |
| 107.868 | |
| 112.411 | |
| 114.818 | |
| 118.710 | |
| 121.760 | |
| 127.600 | |
| 126.904 | |
| 131.293 | |
| 132.905 | |
| 137.327 | |
| 138.905 | |
| 140.116 | |
| 140.907 | |
| 144.242 | |
| [145] | |
| 150.360 | |
| 151.964 | |
| 157.250 | |
| 158.925 | |
| 162.500 | |
| 164.930 | |
| 167.259 | |
| 168.934 | |
| 173.054 | |
| 174.966 | |
| 178.490 | |
| 180.947 | |
| 183.840 | |
| 186.207 | |
| 190.230 | |
| 192.217 | |
| 195.084 | |
| | Weight | Element | # of Neutrons |
| 196.666 | |
| 200.590 | |
| 204.383 | |
| 207.200 | |
| 208.980 | |
| [210] | |
| [210] | |
| [222] | |
| [223] | |
| [226] | |
| [227] | |
| 232.038 | |
| 231.035 | |
| 238.028 | |
| [237] | |
| [244] | |
| [243] | |
| [247] | |
| [247] | |
| [251] | |
| [252] | |
| [257] | |
| [258] | |
| [259] | |
| [262] | |
| [261] | |
| [262] | |
| [266] | |
| [264] | |
| [267] | |
| [268] | |
| [271] | |
| [272] | |
| [285] | |
| [284] | |
| [289] | |
| [288] | |
| [292] | |
| [294] | |
|