Np
Нептуній
Z 93 237,0 г/мольАктиноїд Радіоактивний
| 219Np | 126 | 219,0316 | 29 440,0 | --- | 570,0 мкс | (9/2-) | α→215Pa(100%) | 2015 |
| 220Np | 127 | 220,0327 | 30 480,0 | --- | 29,0 нс | (1-) | α→216Pa(100%) | 2019 |
| 221Np | 128 | 221,0321 | 29 910,0 | --- | 30,0 нс | (9/2-) | α→217Pa | --- |
| 222Np | 129 | 222,0336 | 31 270,0 | --- | 480,0 нс | (1-) | α→218Pa(100%) | 2020 |
| 223Np | 130 | 223,0329 | 30 660,0 | --- | 2,5 мкс | (9/2-) | α→219Pa(100%) | 2017 |
| 224Np | 131 | 224,0344 | 32 032,0 | --- | 48,0 мкс | (2-) | α→220Pa(100%) | 2018 |
| 225Np | 132 | 225,0339 | 31 620,0 | --- | 6,5 мс | (9/2-) | α→221Pa(100%) β⁺→225U | 1994 |
| 226Np | 133 | 226,0352 | 32 820,0 | --- | 35,0 мс | --- | α→222Pa(100%) β⁺→226U | 1990 |
| 227Np | 134 | 227,035 | 32 580,0 | --- | 510,0 мс | (5/2+) | α→223Pa(100%) β⁺→227U | 1990 |
| 228Np | 135 | 228,0363 | 33 830,0 | --- | 1,02 хв | (4+) | EC→228U(59%) α→224Pa(41%) β⁺SF(0,012%) | 1994 |
| 229Np | 136 | 229,0363 | 33 800,0 | --- | 4,0 хв | (5/2+) | α→225Pa(68%) β⁺→229U | 1968 |
| 230Np | 137 | 230,0378 | 35 240,0 | --- | 4,6 хв | (4+) | β⁺→230U(<97%) α→226Pa(>3%) | 1968 |
| 231Np | 138 | 231,0382 | 35 620,0 | --- | 48,8 хв | (5/2+) | β⁺→231U(98%) α→227Pa(2%) | 1950 |
| 232Np | 139 | 232,0401 | 37 360,0 | --- | 14,7 хв | (5-) | β⁺→232U(100%) α→228Pa | 1950 |
| 233Np | 140 | 233,0407 | 37 950,0 | --- | 36,2 хв | (5/2+) | β⁺→233U(~100%) α→229Pa(0,001%) | 1950 |
| 234Np | 141 | 234,0429 | 39 955,0 | --- | 4,4 д | (0+) | β⁺→234U(100%) | 1949 |
| 235Np | 142 | 235,0441 | 41 043,0 | --- | 1,08 р | 5/2+ | EC→235U(99,997%) α→231Pa(0,003%) | 1949 |
| 236Np | 143 | 236,0466 | 43 380,0 | --- | 153,0 кр | (6-) | EC→236U(86,3%) β⁻→236Pu(13,5%) α→232Pa(0,16%) | 1949 |
| 236mNp | 143 | 236,0466 | 43 438,0 | --- | 22,5 год | (1-) | EC→236U(50%) β⁻→236Pu(50%) | 1949 |
| 237Np | 144 | 237,0482 | 44 871,6 | --- | 2,14 Мр | 5/2+ | α→233Pa(~100%) SF(<2е-10%) CD→207Tl(<4е-12%) | 1948 |
| 237mNp | 144 | 237,0492 | 45 816,8 | --- | 710,0 нс | 13/2- | γ→237Np(100%) | 1990 |
| 238Np | 145 | 238,0509 | 47 454,6 | --- | 2,1 д | 2+ | β⁻→238Pu(100%) | 1949 |
| 238mNp | 145 | 238,0534 | 49 760,0 | --- | 112,0 нс | --- | SF(100%) γ→238Np | 1970 |
| 239Np | 146 | 239,0529 | 49 311,0 | --- | 2,36 д | 5/2+ | β⁻→239Pu(100%) α→235Pa | 1940 |
| 240Np | 147 | 240,0562 | 52 316,0 | --- | 1,03 год | (5+) | β⁻→240Pu(100%) | 1953 |
| 240mNp | 147 | 240,0562 | 52 334,0 | --- | 7,22 хв | (1+) | β⁻→240Pu(99,88%) γ→240Np(0,12%) | 1948 |
| 241Np | 148 | 241,0583 | 54 320,0 | --- | 13,9 хв | (5/2+) | β⁻→241Pu(100%) α→237Pa | 1959 |
| 242Np | 149 | 242,0616 | 57 420,0 | --- | 2,2 хв | (1+) | β⁻→242Pu(100%) | 1979 |
| 242mNp | 149 | 242,0617 | 57 470,0 | --- | 5,5 хв | (6+) | β⁻→242Pu(100%) | 1981 |
| 243Np | 150 | 243,0642 | 59 810,0 | --- | 1,85 хв | (5/2+) | β⁻→243Pu(100%) | 1979 |
| 244Np | 151 | 244,0679 | 63 240,0 | --- | 2,29 хв | (7-) | β⁻→244Pu(100%) | 1987 |
| 245Np | 152 | 245,0707 | 65 850,0 | --- | 6,0 хв | (5/2+) | β⁻→245Pu | --- |