Es
Einsteinium
Z 99 252.0 g/molActinide Radioactive
| 239Es | 140 | 239.0683 | 63,630.0 | --- | 1.0 s | (3/2-) | α→235Bk β⁺→239Cf SF | --- |
| 240Es | 141 | 240.069 | 64,230.0 | --- | 6.0 s | (4-) | α→236Bk(70%) β⁺→240Cf(29.84%) β⁺SF(0.16%) | 2017 |
| 241Es | 142 | 241.0686 | 63,890.0 | --- | 5.1 s | (3/2-) | α→237Bk(100%) β⁺→241Cf | 1996 |
| 242Es | 143 | 242.0696 | 64,800.0 | --- | 17.8 s | (2+) | α→238Bk(57%) β⁺→242Cf(42.4%) β⁺SF(0.6%) | 1994 |
| 243Es | 144 | 243.0695 | 64,750.0 | --- | 22.1 s | (7/2+) | α→239Bk(61%) SF(<1%) β⁺→243Cf | 1973 |
| 243mEs | 144 | 243.0696 | 64,800.0 | --- | --- | (3/2-) | γ→243Es α→239Bk β⁺→243Cf | --- |
| 244Es | 145 | 244.0709 | 66,030.0 | --- | 37.0 s | (6+) | β⁺→244Cf(94.989%) α→240Bk(5%) β⁺SF(0.011%) | 1973 |
| 245Es | 146 | 245.0712 | 66,320.0 | --- | 1.11 m | (3/2-) | β⁺→245Cf(51%) α→241Bk(49%) | 1967 |
| 245mEs | 146 | 245.0712 | 66,350.0 | --- | --- | (7/2+) | γ→245Es β⁺→245Cf α→241Bk | 1967 |
| 246Es | 147 | 246.0728 | 67,820.0 | --- | 7.5 m | (4-) | β⁺→246Cf(90.097%) α→242Bk(9.9%) β⁺SF(0.003%) | 1954 |
| 247Es | 148 | 247.0736 | 68,578.0 | --- | 4.55 m | (7/2+) | β⁺→247Cf(93%) α→243Bk(7%) SF | 1967 |
| 247mEs | 148 | 247.0737 | 68,630.0 | --- | --- | (3/2-) | γ→247Es β⁺→247Cf α→243Bk | --- |
| 248Es | 149 | 248.0755 | 70,300.0 | --- | 24.0 m | (2-) | β⁺→248Cf(~100%) α→244Bk(0.25%) β⁺SF(3.5e-4%) | 1956 |
| 249Es | 150 | 249.0764 | 71,180.0 | --- | 1.7 h | 7/2+ | β⁺→249Cf(~100%) α→245Bk(0.57%) | 1956 |
| 250Es | 151 | 250.0786 | 73,230.0 | --- | 8.6 h | (6+) | β⁺→250Cf(100%) α→246Bk | 1956 |
| 250mEs | 151 | 250.0788 | 73,430.0 | --- | 2.22 h | (1-) | β⁺→250Cf(100%) α→246Bk | 1970 |
| 251Es | 152 | 251.08 | 74,512.0 | --- | 1.38 d | 3/2- | EC→251Cf(99.5%) α→247Bk(0.5%) | 1956 |
| 251mEs | 152 | 251.08 | 74,520.0 | --- | --- | (7/2+) | γ→251Es EC→251Cf | --- |
| 252Es | 153 | 252.083 | 77,290.0 | --- | 1.29 y | (4+) | α→248Bk(78%) EC→252Cf(22%) | 1956 |
| 253Es | 154 | 253.0848 | 79,010.5 | --- | 20.47 d | 7/2+ | α→249Bk(~100%) SF(8.7e-6%) | 1954 |
| 253mEs | 154 | 253.0849 | 79,117.0 | --- | --- | (3/2-) | γ→253Es | --- |
| 254Es | 155 | 254.088 | 81,994.2 | --- | 275.7 d | 7+ | α→250Bk(~100%) β⁻→254Fm(1.74e-4%) SF(<3e-6%) EC→254Cf | 1954 |
| 254mEs | 155 | 254.0881 | 82,074.5 | --- | 1.64 d | 2+ | β⁻→254Fm(98%) γ→254Es(<3%) α→250Bk(0.32%) EC→254Cf(0.076%) SF(<0.045%) | 1954 |
| 255Es | 156 | 255.0903 | 84,089.0 | --- | 39.8 d | (7/2+) | β⁻→255Fm(92%) α→251Bk(8%) SF(0.004%) | 1954 |
| 256Es | 157 | 256.0936 | 87,190.0 | --- | 7.6 h | (7+) | β⁻→256Fm(99.998%) β⁻SF(0.002%) | 1976 |
| 256mEs | 157 | 256.0936 | 87,190.0 | --- | 25.4 m | (0+) | β⁻→256Fm(100%) | 1981 |
| 257Es | 158 | 257.096 | 89,400.0 | --- | 7.7 d | (7/2+) | β⁻→257Fm(100%) α→253Bk | 1987 |
| 258Es | 159 | 258.0995 | 92,700.0 | --- | 4.0 m | --- | β⁻→258Fm α→254Bk | --- |