Md
Менделевій
Z 101 258,0 г/мольАктиноїд Радіоактивний
| 244Md | 143 | 244,0812 | 75 600,0 | --- | 360,0 мс | (3+) | α→240Es(100%) β⁺SF(<14%) β⁺→244Fm | 2020 |
| 244mMd | 143 | 244,0814 | 75 800,0 | --- | --- | (7+) | γ→244Md β⁺→244Fm | 2020 |
| 245Md | 144 | 245,0809 | 75 330,0 | --- | 380,0 мс | (7/2-) | α→241Es(100%) β⁺→245Fm | 1996 |
| 245mMd | 144 | 245,081 | 75 430,0 | --- | 900,0 мкс | (1/2-) | SF(100%) α→241Es | 1996 |
| 246Md | 145 | 246,0817 | 76 120,0 | --- | 920,0 мс | (1-) | α→242Es(100%) | 1996 |
| 246mMd | 145 | 246,0818 | 76 170,0 | --- | 4,4 с | (4-) | β⁺→246Fm(>77%) α→242Es(57%) α→242Es(<23%) β⁺SF(>10%) | 2010 |
| 247Md | 146 | 247,0815 | 75 940,0 | --- | 1,19 с | (7/2-) | α→243Es(~100%) SF(<0,1%) | 1981 |
| 247mMd | 146 | 247,0818 | 76 200,0 | --- | 250,0 мс | (1/2-) | α→243Es(79%) SF(21%) | 1993 |
| 248Md | 147 | 248,0826 | 76 950,0 | --- | 7,0 с | --- | β⁺→248Fm(80%) α→244Es(20%) β⁺SF(<0,05%) | 1973 |
| 249Md | 148 | 249,0829 | 77 180,0 | --- | 25,6 с | (7/2-) | α→245Es(75%) β⁺→249Fm | 1973 |
| 249mMd | 148 | 249,083 | 77 280,0 | --- | 1,9 с | (1/2-) | α→245Es(100%) | 2001 |
| 250Md | 149 | 250,0842 | 78 400,0 | --- | 54,0 с | (2-) | β⁺→250Fm(92,974%) α→246Es(7%) β⁺SF(0,026%) | 1973 |
| 250mMd | 149 | 250,0843 | 78 520,0 | --- | 42,4 с | (7+) | α→246Es β⁺→250Fm γ→250Md | 2019 |
| 251Md | 150 | 251,0848 | 78 967,0 | --- | 4,21 хв | (7/2-) | α→247Es(10%) β⁺→251Fm | 1973 |
| 252Md | 151 | 252,0864 | 80 470,0 | --- | 2,3 хв | (1+) | β⁺→252Fm(100%) α→248Es | 1973 |
| 253Md | 152 | 253,0871 | 81 170,0 | --- | 12,0 хв | (7/2-) | β⁺→253Fm(~100%) α→249Es(0,7%) | 1992 |
| 254Md | 153 | 254,0896 | 83 450,0 | --- | 10,0 хв | (0-) | β⁺→254Fm(100%) α→250Es | 1970 |
| 254mMd | 153 | 254,0896 | 83 500,0 | --- | 28,0 хв | (3-) | β⁺→254Fm(100%) α→250Es | 1970 |
| 255Md | 154 | 255,0911 | 84 842,0 | --- | 27,0 хв | 7/2- | β⁺→255Fm(93%) α→251Es(7%) SF | 1958 |
| 256Md | 155 | 256,0939 | 87 460,0 | --- | 1,3 год | (1-) | β⁺→256Fm(90,8%) α→252Es(9,2%) SF(<3%) | 1955 |
| 256mMd | 155 | 256,0941 | 87 620,0 | --- | 1,67 год | (7-) | β⁺→256Fm α→252Es SF | --- |
| 257Md | 156 | 257,0955 | 88 992,5 | --- | 5,52 год | (7/2-) | EC→257Fm(85%) α→253Es(15%) SF | 1965 |
| 258Md | 157 | 258,0984 | 91 690,0 | --- | 51,59 д | (8-) | α→254Es(~100%) β⁺→258Fm(<0,002%) β⁻→258No(<0,002%) | 1970 |
| 258mMd | 157 | 258,0984 | 91 690,0 | --- | 57,0 хв | (1-) | EC→258Fm(85%) SF(<15%) α→254Es(<1,2%) β⁻→258No | 1980 |
| 259Md | 158 | 259,1004 | 93 560,0 | --- | 1,6 год | (7/2-) | SF(100%) α→255Es | 1982 |
| 260Md | 159 | 260,1037 | 96 550,0 | --- | 27,8 д | --- | SF(100%) α→256Es(<5%) EC→260Fm(<5%) β⁻→260No(<3,5%) | 1989 |
| 261Md | 160 | 261,1058 | 98 580,0 | --- | 40,0 хв | (7/2-) | α→257Es | --- |
| 262Md | 161 | 262,1091 | 101 670,0 | --- | 3,0 хв | --- | SF α→258Es | --- |