| Element Isotopes | Atomic Mass (amu) | Half Life |
| 247Md |
247.08165 |
3. s |
| 248Md |
248.082750 |
7. s |
| 249Md |
249.082950 |
24. s |
| 250Md |
250.084380 |
50.s |
| 251Md |
251.084830 |
4.0 m |
| 252Md |
252.086470 |
2. m |
| 253Md |
253.08721 |
|
| 254mMd |
30.m |
|
| 254Md |
254.089630 |
10.m |
| 255Md |
255.091081 |
27. m |
| 256Md |
256.093960 |
1.30 h |
| 257Md |
257.095580 |
5.5 h |
| 258mMd |
257.095580 |
57. m |
| 258Md |
258.098570 |
51.5 d |
| 259Md |
1.64 h |
|
| 260Md |
32. d |
|
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*Note: Mendelevium and all the isotopes are radioactive.