Er
Erbium
Z 68 167.259 g/molLanthanide
| 166Er | 98 | 165.9303 | -64,924.1 | 33.503% | Stable | 0+ | --- | 1934 |
| 168Er | 100 | 167.9324 | -62,989.23 | 26.978% | Stable | 0+ | --- | 1934 |
| 167Er | 99 | 166.9321 | -63,289.26 | 22.869% | Stable | 7/2+ | --- | 1934 |
| 170Er | 102 | 169.9355 | -60,107.5 | 14.91% | Stable | 0+ | β⁻ α→166Dy | 1934 |
| 164Er | 96 | 163.9292 | -65,942.6 | 1.601% | Stable | 0+ | α→160Dy β⁺ | 1938 |
| 162Er | 94 | 161.9288 | -66,334.2 | 0.139% | Stable | 0+ | α→158Dy β⁺ | 1938 |
| 142Er | 74 | 141.97 | -27,930.0 | --- | 10.0 µs | 0+ | p→141Ho | --- |
| 143Er | 75 | 142.9665 | -31,160.0 | --- | 200.0 ms | (9/2-) | β⁺→143Ho β⁺p→142Dy | 2005 |
| 144Er | 76 | 143.9607 | -36,610.0 | --- | 400.0 ms | 0+ | β⁺→144Ho | 2003 |
| 145Er | 77 | 144.9579 | -39,240.0 | --- | 900.0 ms | (1/2+) | β⁺→145Ho(100%) β⁺p→144Dy | 1989 |
| 145mEr | 77 | 144.9581 | -39,040.0 | --- | 1.0 s | (11/2-) | β⁺→145Ho(100%) γ→145Er β⁺p→144Dy | 2010 |
| 146Er | 78 | 145.9524 | -44,322.0 | --- | 1.7 s | 0+ | β⁺→146Ho(100%) β⁺p→145Dy | 1993 |
| 147Er | 79 | 146.95 | -46,610.0 | --- | 3.2 s | (1/2+) | β⁺→147Ho(100%) β⁺p→146Dy | 1992 |
| 147mEr | 79 | 146.9501 | -46,510.0 | --- | 1.6 s | (11/2-) | β⁺→147Ho(100%) β⁺p→146Dy | 1982 |
| 148Er | 80 | 147.9447 | -51,479.0 | --- | 4.6 s | 0+ | β⁺→148Ho(99.85%) β⁺p→147Dy(0.15%) | 1982 |
| 148mEr | 80 | 147.9479 | -48,566.0 | --- | 13.0 µs | (10+) | γ→148Er(100%) | 1982 |
| 149Er | 81 | 148.9423 | -53,742.0 | --- | 4.0 s | (1/2+) | β⁺→149Ho(93%) β⁺p→148Dy(7%) | 1984 |
| 149mEr | 81 | 148.9431 | -53,000.0 | --- | 8.9 s | (11/2-) | β⁺→149Ho(96.32%) γ→149Er(3.5%) β⁺p→148Dy(0.18%) | 1984 |
| 149nEr | 81 | 148.9451 | -51,131.0 | --- | 610.0 ns | (19/2+) | γ→149Er(100%) | 1987 |
| 150Er | 82 | 149.9379 | -57,831.0 | --- | 18.5 s | 0+ | β⁺→150Ho(100%) | 1982 |
| 150mEr | 82 | 149.9409 | -55,035.0 | --- | 2.55 µs | 10+ | γ→150Er(100%) | 1984 |
| 151Er | 83 | 150.9374 | -58,266.0 | --- | 23.5 s | (7/2-) | β⁺→151Ho(100%) | 1970 |
| 151mEr | 83 | 150.9402 | -55,680.0 | --- | 580.0 ms | (27/2-) | γ→151Er(95.3%) β⁺→151Ho(4.7%) | 1980 |
| 151nEr | 83 | 150.9485 | -47,979.0 | --- | 420.0 ns | (65/2+) | γ→151Er(100%) | 1990 |
| 152Er | 84 | 151.9351 | -60,500.0 | --- | 10.3 s | 0+ | α→148Dy(90%) β⁺→152Ho(10%) | 1963 |
| 153Er | 85 | 152.9351 | -60,467.0 | --- | 37.1 s | 7/2- | α→149Dy(53%) β⁺→153Ho(47%) | 1963 |
| 153mEr | 85 | 152.9381 | -57,669.0 | --- | 373.0 ns | (27/2-) | γ→153Er(100%) | 1979 |
| 153nEr | 85 | 152.9407 | -55,219.0 | --- | 248.0 ns | (41/2-) | γ→153Er(100%) | 1979 |
| 154Er | 86 | 153.9328 | -62,605.0 | --- | 3.73 m | 0+ | β⁺→154Ho(~100%) α→150Dy(0.47%) | 1963 |
| 155Er | 87 | 154.9332 | -62,209.0 | --- | 5.3 m | 7/2- | β⁺→155Ho(99.978%) α→151Dy(0.022%) | 1969 |
| 156Er | 88 | 155.9311 | -64,212.0 | --- | 19.5 m | 0+ | β⁺→156Ho(~100%) α→152Dy(1.2e-5%) | 1967 |
| 157Er | 89 | 156.9319 | -63,414.0 | --- | 18.65 m | 3/2- | β⁺→157Ho(100%) | 1966 |
| 157mEr | 89 | 156.9321 | -63,259.0 | --- | 76.0 ms | 9/2+ | γ→157Er(100%) | 1971 |
| 158Er | 90 | 157.9299 | -65,304.0 | --- | 2.29 h | 0+ | EC→158Ho(100%) | 1961 |
| 159Er | 91 | 158.9307 | -64,561.0 | --- | 36.0 m | 3/2- | β⁺→159Ho(100%) | 1962 |
| 159mEr | 91 | 158.9309 | -64,378.0 | --- | 337.0 ns | 9/2+ | γ→159Er(100%) | 1971 |
| 159nEr | 91 | 158.9312 | -64,132.0 | --- | 590.0 ns | 11/2- | γ→159Er(100%) | 1971 |
| 160Er | 92 | 159.9291 | -66,064.0 | --- | 1.19 d | 0+ | EC→160Ho(100%) | 1954 |
| 161Er | 93 | 160.93 | -65,201.0 | --- | 3.21 h | 3/2- | β⁺→161Ho(100%) | 1954 |
| 161mEr | 93 | 160.9304 | -64,805.0 | --- | 7.5 µs | 11/2- | γ→161Er(100%) | 1969 |
| 162mEr | 94 | 161.931 | -64,308.2 | --- | 88.0 ns | (7-) | γ→162Er(100%) | 1974 |
| 163Er | 95 | 162.93 | -65,167.0 | --- | 1.25 h | 5/2- | β⁺→163Ho(100%) | 1953 |
| 163mEr | 95 | 162.9305 | -64,722.0 | --- | 580.0 ns | (11/2-) | γ→163Er(100%) | 1974 |
| 165Er | 97 | 164.9307 | -64,521.4 | --- | 10.36 h | 5/2- | EC→165Ho(100%) | 1950 |
| 165mEr | 97 | 164.9313 | -63,970.1 | --- | 250.0 ns | 11/2- | γ→165Er(100%) | 1970 |
| 165nEr | 97 | 164.9327 | -62,698.4 | --- | 370.0 ns | (19/2) | γ→165Er(100%) | 2012 |
| 167mEr | 99 | 166.9323 | -63,081.46 | --- | 2.27 s | 1/2- | γ→167Er(100%) | 1986 |
| 168mEr | 100 | 167.9336 | -61,895.19 | --- | 109.0 ns | 4- | γ→168Er(100%) | 1974 |
| 169Er | 101 | 168.9346 | -60,921.2 | --- | 9.39 d | 1/2- | β⁻→169Tm(100%) | 1956 |
| 169mEr | 101 | 168.9347 | -60,829.2 | --- | 285.0 ns | (5/2-) | γ→169Er(100%) | 1969 |
| 169nEr | 101 | 168.9349 | -60,677.5 | --- | 200.0 ns | 7/2+ | γ→169Er(100%) | 1969 |
| 171Er | 103 | 170.938 | -57,717.8 | --- | 7.52 h | 5/2- | β⁻→171Tm(100%) | 1938 |
| 171mEr | 103 | 170.9383 | -57,519.2 | --- | 210.0 ns | 1/2- | γ→171Er(100%) | 1969 |
| 172Er | 104 | 171.9394 | -56,483.0 | --- | 2.05 d | 0+ | β⁻→172Tm(100%) | 1956 |
| 172mEr | 104 | 171.941 | -54,982.0 | --- | 579.0 ns | (6+) | γ→172Er(100%) | 2006 |
| 173Er | 105 | 172.9424 | -53,650.0 | --- | 1.43 m | (7/2-) | β⁻→173Tm(100%) | 1972 |
| 174Er | 106 | 173.9442 | -51,950.0 | --- | 3.2 m | 0+ | β⁻→174Tm(100%) | 1989 |
| 174mEr | 106 | 173.9454 | -50,840.0 | --- | 3.9 s | 8- | γ→174Er(100%) | 2006 |
| 175Er | 107 | 174.9478 | -48,650.0 | --- | 1.2 m | (9/2+) | β⁻→175Tm(100%) | 1996 |
| 176Er | 108 | 175.9499 | -46,630.0 | --- | 12.0 s | 0+ | β⁻→176Tm | 2012 |
| 177Er | 109 | 176.954 | -42,860.0 | --- | 8.0 s | (1/2-) | β⁻→177Tm | 2012 |
| 178Er | 110 | 177.9568 | -40,260.0 | --- | 4.0 s | 0+ | β⁻→178Tm | 2012 |
| 179Er | 111 | 178.9613 | -36,080.0 | --- | 3.0 s | (3/2-) | β⁻→179Tm β⁻n→178Tm | 2018 |
| 180Er | 112 | 179.9644 | -33,180.0 | --- | 2.0 s | 0+ | β⁻→180Tm β⁻n→179Tm | 2018 |