Isotopes of rhodium

Naturally occurring rhodium (45Rh) is composed of only one stable isotope, 103Rh. The most stable radioisotopes are 101Rh with a half-life of 3.3 years, 102Rh with a half-life of 207 days, and 99Rh with a half-life of 16.1 days. Thirty other radioisotopes have been characterized with atomic weights ranging from 88.949 u (89Rh) to 121.943 u (122Rh). Most of these have half-lives that are less than an hour except 100Rh (half-life: 20.8 hours) and 105Rh (half-life: 35.36 hours). There are also numerous meta states with the most stable being 102mRh (0.141 MeV) with a half-life of about 3.7 years and 101mRh (0.157 MeV) with a half-life of 4.34 days.

The primary decay mode before the only stable isotope, 103Rh, is electron capture and the primary mode after is beta emission. The primary decay product before 103Rh is ruthenium and the primary product after is palladium.

List of isotopes

 * rowspan=2|90Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2|89.94457(22)#
 * rowspan=2|29(3) ms
 * β+
 * 90Ru
 * rowspan=2|(0+)
 * rowspan=2|
 * β+, p? (<0.7%)
 * 89Tc
 * rowspan=2 style="text-indent:1em" | 90mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 0(500)# keV
 * rowspan=2|0.56(2) s
 * β+ (90.4%)
 * 90Ru
 * rowspan=2|(7+)
 * rowspan=2|
 * β+, p (9.6%)
 * 89Tc
 * rowspan=2|91Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 46
 * rowspan=2|90.93712(32)#
 * rowspan=2|1.47(22) s
 * β+ (98.7%)
 * 91Ru
 * rowspan=2|(9/2+)
 * rowspan=2|
 * β+, p (1.3%)
 * 90Tc
 * rowspan=3 style="text-indent:1em" | 91mRh
 * rowspan=3 colspan="3" style="text-indent:2em" | 172.9(4) keV
 * rowspan=3|1.8# s
 * β+?
 * 91Ru
 * rowspan=3|1/2−#
 * rowspan=3|
 * β+, p?
 * 90Tc
 * IT?
 * 91Rh
 * rowspan=2|92Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 47
 * rowspan=2|91.9323677(47)
 * rowspan=2|5.61(8) s
 * β+ (97.95%)
 * 92Ru
 * rowspan=2|(6+)
 * rowspan=2|
 * β+, p (2.05%)
 * 91Tc
 * rowspan=2 style="text-indent:1em" | 92m1Rh
 * rowspan=2 colspan="3" style="text-indent:2em" | 50(100)# keV
 * rowspan=2|3.18(22) s
 * β+ (98.3%)
 * 92Ru
 * rowspan=2|(2+)
 * rowspan=2|
 * β+, p (1.7%)
 * 91Tc
 * style="text-indent:1em" | 92m2Rh
 * colspan="3" style="text-indent:2em" | 105(100)# keV
 * 232(15) ns
 * IT
 * 92Rh
 * (4+)
 * 93Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 48
 * 92.9259128(28)
 * 13.9(16) s
 * β+
 * 93Ru
 * 9/2+#
 * rowspan=2|94Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 49
 * rowspan=2|93.9217305(36)
 * rowspan=2|70.6(6) s
 * β+ (98.2%)
 * 94Ru
 * rowspan=2|(4+)
 * rowspan=2|
 * β+, p (1.8%)
 * 93Tc
 * style="text-indent:1em" | 94m1Rh
 * colspan="3" style="text-indent:2em" | 54.60(20)# keV
 * 480(30) ns
 * IT
 * 94Rh
 * (2+)
 * style="text-indent:1em" | 94m2Rh
 * colspan="3" style="text-indent:2em" | 300(200)# keV
 * 25.8(2) s
 * β+
 * 94Ru
 * (8+)
 * 95Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 50
 * 94.9158979(42)
 * 5.02(10) min
 * β+
 * 95Ru
 * (9/2)+
 * rowspan=2 style="text-indent:1em" | 95mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 543.3(3) keV
 * rowspan=2|1.96(4) min
 * IT (88%)
 * 95Rh
 * rowspan=2|(1/2)−
 * rowspan=2|
 * β+ (12%)
 * 95Ru
 * 96Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 51
 * 95 914452(11)
 * 9.90(10) min
 * β+
 * 96Ru
 * 6+
 * rowspan=2 style="text-indent:1em" | 96mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 51.98(9) keV
 * rowspan=2|1.51(2) min
 * IT (60%)
 * 96Rh
 * rowspan=2|3+
 * rowspan=2|
 * β+ (40%)
 * 96Ru
 * 97Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 52
 * 96.911328(38)
 * 30.7(6) min
 * β+
 * 97Ru
 * 9/2+
 * rowspan=2 style="text-indent:1em" | 97mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 258.76(18) keV
 * rowspan=2|46.2(16) min
 * β+ (94.4%)
 * 97Ru
 * rowspan=2|1/2−
 * rowspan=2|
 * IT (5.6%)
 * 97Rh
 * 98Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 53
 * 97.910708(13)
 * 8.72(12) min
 * β+
 * 98Ru
 * (2)+
 * rowspan=2 style="text-indent:1em" | 98mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 56.3(10) keV
 * rowspan=2|3.6(2) min
 * IT (89%)
 * 98Rh
 * rowspan=2|(5+)
 * rowspan=2|
 * β+ (11%)
 * 98Ru
 * 99Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 54
 * 98.908121(21)
 * 16.1(2) d
 * β+
 * 99Ru
 * 1/2−
 * rowspan=2 style="text-indent:1em" | 99mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 64.4(5) keV
 * rowspan=2|4.7(1) h
 * β+
 * 99Ru
 * rowspan=2|9/2+
 * rowspan=2|
 * IT?
 * 99Rh
 * rowspan=2|100Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 55
 * rowspan=2|99.908114(19)
 * rowspan=2|20.8(1) h
 * EC (95.1%)
 * 100Ru
 * rowspan=2|1−
 * rowspan=2|
 * β+ (4.9%)
 * 100Ru
 * style="text-indent:1em" | 100m1Rh
 * colspan="3" style="text-indent:2em" | 74.782(14) keV
 * 214.0(20) ns
 * IT
 * 100Rh
 * (2)+
 * rowspan=2 style="text-indent:1em" | 100m2Rh
 * rowspan=2 colspan="3" style="text-indent:2em" | 107.6(2) keV
 * rowspan=2|4.6(2) min
 * IT (98.3%)
 * 100Rh
 * rowspan=2|(5+)
 * rowspan=2|
 * β+ (1.7%)
 * 100Ru
 * style="text-indent:1em" | 100m3Rh
 * colspan="3" style="text-indent:2em" | 219.61(22) keV
 * 130(10) ns
 * IT
 * 100Rh
 * (7+)
 * 101Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 56
 * 100.9061589(63)
 * 4.07(5) y
 * EC
 * 101Ru
 * 1/2−
 * rowspan=2 style="text-indent:1em" | 101mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 157.32(3) keV
 * rowspan=2|4.343(10) d
 * EC (92.80%)
 * 101Ru
 * rowspan=2|9/2+
 * rowspan=2|
 * IT (7.20%)
 * 101Rh
 * rowspan=2|102Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 57
 * rowspan=2|101.9068343(69)
 * rowspan=2|207.0(15) d
 * β+ (78%)
 * 102Ru
 * rowspan=2|2−
 * rowspan=2|
 * β− (22%)
 * 102Pd
 * rowspan=2 style="text-indent:1em" | 102mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 140.73(9) keV
 * rowspan=2|3.742(10) y
 * β+ (99.77%)
 * 102Ru
 * rowspan=2|6+
 * rowspan=2|
 * IT (0.233%)
 * 102Rh
 * 103Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 58
 * 102.9054941(25)
 * colspan=3 align=center|Stable
 * 1/2−
 * 1.0000
 * style="text-indent:1em" | 103mRh
 * colspan="3" style="text-indent:2em" | 39.753(6) keV
 * 56.114(9) min
 * IT
 * 103Rh
 * 7/2+
 * rowspan=2|104Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 59
 * rowspan=2|103.9066453(25)
 * rowspan=2|42.3(4) s
 * β− (99.55%)
 * 104Pd
 * rowspan=2|1+
 * rowspan=2|
 * β+ (0.45%)
 * 104Ru
 * rowspan=2 style="text-indent:1em" | 104mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 128.9679(5) keV
 * rowspan=2|4.34(3) min
 * IT (99.87%)
 * 104Rh
 * rowspan=2|5+
 * rowspan=2|
 * β− (0.13%)
 * 104Pd
 * 105Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 60
 * 104.9056878(27)
 * 35.341(19) h
 * β−
 * 105Pd
 * 7/2+
 * style="text-indent:1em" | 105mRh
 * colspan="3" style="text-indent:2em" | 129.742(4) keV
 * 42.8(3) s
 * IT
 * 105Rh
 * 1/2−
 * 106Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 61
 * 105.9072859(58)
 * 30.07(35) s
 * β−
 * 106Pd
 * 1+
 * style="text-indent:1em" | 106mRh
 * colspan="3" style="text-indent:2em" | 132(11) keV
 * 131(2) min
 * β−
 * 106Pd
 * (6)+
 * 107Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 62
 * 106.906748(13)
 * 21.7(4) min
 * β−
 * 107Pd
 * 7/2+
 * style="text-indent:1em" | 107mRh
 * colspan="3" style="text-indent:2em" | 268.36(4) keV
 * >10 μs
 * IT
 * 107Rh
 * 1/2−
 * 108Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 63
 * 107.908715(15)
 * 16.8(5) s
 * β−
 * 108Pd
 * 1+
 * style="text-indent:1em" | 108mRh
 * colspan="3" style="text-indent:2em" | 115(18) keV
 * 6.0(3) min
 * β−
 * 108Pd
 * (5+)
 * 109Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 64
 * 108.9087496(43)
 * 80.8(7) s
 * β−
 * 109Pd
 * 7/2+
 * style="text-indent:1em" | 109mRh
 * colspan="3" style="text-indent:2em" | 225.873(19) keV
 * 1.66(4) μs
 * IT
 * 109Pd
 * 3/2+
 * 110Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 65
 * 109.911080(19)
 * 3.35(12) s
 * β−
 * 110Pd
 * (1+)
 * style="text-indent:1em" | 110mRh
 * colspan="3" style="text-indent:2em" | 220(150)# keV
 * 28.5(13) s
 * β−
 * 110Pd
 * (6+)
 * 111Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 66
 * 110.9116432(74)
 * 11(1) s
 * β−
 * 111Pd
 * (7/2+)
 * 112Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 67
 * 111.914405(47)
 * 3.4(4) s
 * β−
 * 112Pd
 * (1+)
 * style="text-indent:1em" | 112mRh
 * colspan="3" style="text-indent:2em" | 340(70) keV
 * 6.73(15) s
 * β−
 * 112Pd
 * (6+)
 * 113Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 68
 * 112.9154402(77)
 * 2.80(12) s
 * β−
 * 113Pd
 * (7/2+)
 * 114Rh
 * style="text-align:right" | 45
 * style="text-align:right" | 69
 * 113.918722(77)
 * 1.85(5) s
 * β−
 * 114Pd
 * 1+
 * style="text-indent:1em" | 114mRh
 * colspan="3" style="text-indent:2em" | 200(150)# keV
 * 1.85(5) s
 * β−
 * 114Pd
 * (7−)
 * rowspan=2|115Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 70
 * rowspan=2|114.9203116(79)
 * rowspan=2|1.03(3) s
 * β−
 * 115Pd
 * rowspan=2|(7/2+)
 * rowspan=2|
 * β−, n?
 * 114Pd
 * rowspan=2|116Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 71
 * rowspan=2|115.924062(79)
 * rowspan=2|685(39) ms
 * β− (>97.9%)
 * 116Pd
 * rowspan=2|1+
 * rowspan=2|
 * β−, n? (<2.1%)
 * 115Pd
 * rowspan=2 style="text-indent:1em" | 116mRh
 * rowspan=2 colspan="3" style="text-indent:2em" | 200(150)# keV
 * rowspan=2|570(50) ms
 * β− (>97.9%)
 * 116Pd
 * rowspan=2|(6−)
 * rowspan=2|
 * β−, n? (<2.1%)
 * 115Pd
 * rowspan=2|117Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 72
 * rowspan=2|116.9260363(95)
 * rowspan=2|421(30) ms
 * β−
 * 117Pd
 * rowspan=2|7/2+#
 * rowspan=2|
 * β−, n? (<7.6%)
 * 115Pd
 * style="text-indent:1em" | 117mRh
 * colspan="3" style="text-indent:2em" | 321.2(10) keV
 * 138(17) ns
 * IT
 * 117Rh
 * 3/2+#
 * rowspan=2|118Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 73
 * rowspan=2|117.930341(26)
 * rowspan=2|282(9) ms
 * β− (96.9%)
 * 118Pd
 * rowspan=2|1+#
 * rowspan=2|
 * β−, n (3.1%)
 * 117Pd
 * rowspan=3 style="text-indent:1em" | 118mRh
 * rowspan=3 colspan="3" style="text-indent:2em" | 200(150)# keV
 * rowspan=3|310(30) ms
 * β− (96.9%)
 * 118Pd
 * rowspan=3|6−#
 * rowspan=3|
 * β−, n (3.1%)
 * 117Pd
 * IT?
 * 118Rh
 * rowspan=2|119Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 74
 * rowspan=2|118.932557(10)
 * rowspan=2|190(6) ms
 * β− (93.6%)
 * 119Pd
 * rowspan=2|7/2+#
 * rowspan=2|
 * β−, n (6.4%)
 * 118Pd
 * rowspan=3| 120Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 75
 * rowspan=3| 119.93707(22)#
 * rowspan=3| 129.6(42) ms
 * β−
 * 120Pd
 * rowspan=3| 8−#
 * rowspan=3|
 * β−, n (<9.3%)
 * 119Pd
 * β−, 2n?
 * 118Pd
 * style="text-indent:1em" | 120mRh
 * colspan="3" style="text-indent:2em" | 157.2(7) keV
 * 295(16) ns
 * IT
 * 120Rh
 * 6#
 * rowspan=2| 121Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 76
 * rowspan=2| 120.93961(67)
 * rowspan=2| 74(4) ms
 * β−
 * 121Pd
 * rowspan=2| 7/2+#
 * rowspan=2|
 * β−, n (>11%)
 * 120Pd
 * rowspan=3| 122Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 77
 * rowspan=3| 121.94431(32)#
 * rowspan=3| 51(6) ms
 * β−
 * 122Pd
 * rowspan=3| 7−#
 * rowspan=3|
 * β−, n (<3.9%)
 * 121Pd
 * β−, 2n?
 * 120Pd
 * style="text-indent:1em" | 122mRh
 * colspan="3" style="text-indent:2em" | 271.0(7) keV
 * 830(120) ns
 * IT
 * 122Rh
 * 4+#
 * rowspan=3| 123Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 78
 * rowspan=3| 122.94719(43)#
 * rowspan=3| 42(4) ms
 * β−
 * 123Pd
 * rowspan=3| 7/2+#
 * rowspan=3|
 * β−, n (>24%)
 * 122Pd
 * β−, 2n?
 * 121Pd
 * rowspan=3| 124Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 79
 * rowspan=3| 123.95200(43)#
 * rowspan=3| 30(2) ms
 * β−
 * 124Pd
 * rowspan=3| 2+#
 * rowspan=3|
 * β−, n (<31%)
 * 123Pd
 * β−, 2n?
 * 122Pd
 * rowspan=3|125Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 80
 * rowspan=3|124.95509(54)#
 * rowspan=3|26.5(20) ms
 * β−
 * 125Pd
 * rowspan=3|7/2+#
 * rowspan=3|
 * β−, n?
 * 124Pd
 * β−, 2n?
 * 123Pd
 * rowspan=3|126Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 81
 * rowspan=3|125.96006(54)#
 * rowspan=3|19(3) ms
 * β−
 * 126Pd
 * rowspan=3|1−#
 * rowspan=3|
 * β−, n?
 * 125Pd
 * β−, 2n?
 * 124Pd
 * rowspan=3|127Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 82
 * rowspan=3|126.96379(64)#
 * rowspan=3|28(14) ms
 * β−
 * 127Pd
 * rowspan=3|7/2+#
 * rowspan=3|
 * β−, n?
 * 126Pd
 * β−, 2n?
 * 125Pd
 * rowspan=3|128Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 83
 * rowspan=3|127.97065(32)#
 * rowspan=3|8# ms [>550 ns]
 * β−?
 * 128Pd
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 127Pd
 * β−, 2n?
 * 126Pd
 * rowspan=3|
 * β−, n (<9.3%)
 * 119Pd
 * β−, 2n?
 * 118Pd
 * style="text-indent:1em" | 120mRh
 * colspan="3" style="text-indent:2em" | 157.2(7) keV
 * 295(16) ns
 * IT
 * 120Rh
 * 6#
 * rowspan=2| 121Rh
 * rowspan=2 style="text-align:right" | 45
 * rowspan=2 style="text-align:right" | 76
 * rowspan=2| 120.93961(67)
 * rowspan=2| 74(4) ms
 * β−
 * 121Pd
 * rowspan=2| 7/2+#
 * rowspan=2|
 * β−, n (>11%)
 * 120Pd
 * rowspan=3| 122Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 77
 * rowspan=3| 121.94431(32)#
 * rowspan=3| 51(6) ms
 * β−
 * 122Pd
 * rowspan=3| 7−#
 * rowspan=3|
 * β−, n (<3.9%)
 * 121Pd
 * β−, 2n?
 * 120Pd
 * style="text-indent:1em" | 122mRh
 * colspan="3" style="text-indent:2em" | 271.0(7) keV
 * 830(120) ns
 * IT
 * 122Rh
 * 4+#
 * rowspan=3| 123Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 78
 * rowspan=3| 122.94719(43)#
 * rowspan=3| 42(4) ms
 * β−
 * 123Pd
 * rowspan=3| 7/2+#
 * rowspan=3|
 * β−, n (>24%)
 * 122Pd
 * β−, 2n?
 * 121Pd
 * rowspan=3| 124Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 79
 * rowspan=3| 123.95200(43)#
 * rowspan=3| 30(2) ms
 * β−
 * 124Pd
 * rowspan=3| 2+#
 * rowspan=3|
 * β−, n (<31%)
 * 123Pd
 * β−, 2n?
 * 122Pd
 * rowspan=3|125Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 80
 * rowspan=3|124.95509(54)#
 * rowspan=3|26.5(20) ms
 * β−
 * 125Pd
 * rowspan=3|7/2+#
 * rowspan=3|
 * β−, n?
 * 124Pd
 * β−, 2n?
 * 123Pd
 * rowspan=3|126Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 81
 * rowspan=3|125.96006(54)#
 * rowspan=3|19(3) ms
 * β−
 * 126Pd
 * rowspan=3|1−#
 * rowspan=3|
 * β−, n?
 * 125Pd
 * β−, 2n?
 * 124Pd
 * rowspan=3|127Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 82
 * rowspan=3|126.96379(64)#
 * rowspan=3|28(14) ms
 * β−
 * 127Pd
 * rowspan=3|7/2+#
 * rowspan=3|
 * β−, n?
 * 126Pd
 * β−, 2n?
 * 125Pd
 * rowspan=3|128Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 83
 * rowspan=3|127.97065(32)#
 * rowspan=3|8# ms [>550 ns]
 * β−?
 * 128Pd
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 127Pd
 * β−, 2n?
 * 126Pd
 * rowspan=3 style="text-align:right" | 82
 * rowspan=3|126.96379(64)#
 * rowspan=3|28(14) ms
 * β−
 * 127Pd
 * rowspan=3|7/2+#
 * rowspan=3|
 * β−, n?
 * 126Pd
 * β−, 2n?
 * 125Pd
 * rowspan=3|128Rh
 * rowspan=3 style="text-align:right" | 45
 * rowspan=3 style="text-align:right" | 83
 * rowspan=3|127.97065(32)#
 * rowspan=3|8# ms [>550 ns]
 * β−?
 * 128Pd
 * rowspan=3|
 * rowspan=3|
 * β−, n?
 * 127Pd
 * β−, 2n?
 * 126Pd
 * β−, n?
 * 127Pd
 * β−, 2n?
 * 126Pd
 * 126Pd