| Atomnummer | 58 | 
|---|---|
| Atommassa | 140.116 | 
| masstal | 140 | 
| Grupp | |
|---|---|
| Period | 6 | 
| Block | f | 
| proton | 58 p+ | 
|---|---|
| neutron | 82 n0 | 
| elektron | 58 e- | 
| Atomradie | |
|---|---|
| molvolym | |
| Kovalent Radie | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waalsradie | |
| densitet | 
| energi | |
|---|---|
| proton affinity | |
| Elektronaffinitet | |
| joniseringsenergi | |
| ångbildningsvärme | |
| smältvärme | |
| Bildningsentalpi | |
| elektron | |
| electron shell | 2, 8, 18, 19, 9, 2 | 
| valenselektron | 2 ⓘ | 
| elektronkonfiguration | [Xe] 4f1 5d1 6s2ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f1 5d1 6s2  | 
| oxidationstal | 2, 3, 4 | 
| elektronegativitet | 
 1.12 
 | 
| Electrophilicity Index | |
| fundamental state of matter | |
| aggregationstillstånd | {ERROR}|
| gaseous state of matter | |
| Kokpunkt | |
| Smältpunkt | |
| critical pressure | |
| critical temperature | |
| trippelpunkt | |
| appearance | |
| färg | Svart 
 | 
| appearance | silvery white | 
| Brytningsindex | |
| materialegenskap | |
| Värmeledningsförmåga | |
| termisk expansion | |
| molar heat capacity | |
| Specifik värmekapacitet | |
| heat capacity ratio | |
| electrical properties | |
| type | Conductor | 
| elektrisk konduktivitet | |
| resistivitet | |
| supraledare | |
| magnetism | |
| type | paramagnetic | 
| magnetisk susceptibilitet (Mass) | 0,00000022 m³/Kg 
 | 
| magnetisk susceptibilitet (Molar) | 0,000000030826 m³/mol 
 | 
| magnetisk susceptibilitet (Volume) | 0,0014716  
 | 
| magnetic ordering | |
| Curiepunkten | |
| Néel temperature | |
| struktur | |
| Kristallstruktur | {ERROR} | 
| Gitterkonstant | |
| Lattice Angles | π/2, π/2, 2 π/3 | 
| mekanisk materialegenskap | |
| hårdhet | |
| Kompressibilitet | |
| skjuvmodul | |
| Young's modulus | |
| Poissons konstant | 0,24  
 | 
| ljudhastighet | |
| klassificering | |
| Kategori | Aktinider, Lanthanides | 
| CAS Group | |
| IUPAC Group | |
| Glawe Number | 31 | 
| Mendeleev Number | 15 | 
| Pettifor Number | 32 | 
| Geochemical Class | rare earth & related | 
| Goldschmidt classification | litophile | 
| Gas Basicity | |
|---|---|
| Polariserbarhet | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Träffyta | 0,6  
 | 
| Neutron Mass Absorption | 0,00021  
 | 
| kvanttal | 1G4 | 
| rymdgrupp | 194 (P63/mmc) | 
| Stabila isotoper | 1 | 
|---|---|
| Instabila isotoper | 40 | 
| Natural Isotopes | 4 | 
| masstal | 119 | 
|---|---|
| neutrontal | 61 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | |
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | |
| β+ p (β+-delayed proton emission) | 
| masstal | 120 | 
|---|---|
| neutrontal | 62 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | |
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | |
| β+ p (β+-delayed proton emission) | 
| masstal | 121 | 
|---|---|
| neutrontal | 63 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 1,1 ± 0,1 s 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1997 | 
| Paritet | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| β+ p (β+-delayed proton emission) | 1% | 
| masstal | 122 | 
|---|---|
| neutrontal | 64 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 2005 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | |
| β+ p (β+-delayed proton emission) | 
| masstal | 123 | 
|---|---|
| neutrontal | 65 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,8 ± 0,2 s 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1984 | 
| Paritet | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| β+ p (β+-delayed proton emission) | 
| masstal | 124 | 
|---|---|
| neutrontal | 66 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 9,1 ± 1,2 s 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1978 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 125 | 
|---|---|
| neutrontal | 67 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 9,7 ± 0,3 s 
 | 
| Spinn | 7/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1978 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| β+ p (β+-delayed proton emission) | 
| masstal | 126 | 
|---|---|
| neutrontal | 68 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 51 ± 0,3 s 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1978 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 127 | 
|---|---|
| neutrontal | 69 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 34 ± 2 s 
 | 
| Spinn | 1/2 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1978 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 128 | 
|---|---|
| neutrontal | 70 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,93 ± 0,02 m 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1968 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 129 | 
|---|---|
| neutrontal | 71 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,5 ± 0,3 m 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1977 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 130 | 
|---|---|
| neutrontal | 72 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 22,9 ± 0,5 m 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1965 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 131 | 
|---|---|
| neutrontal | 73 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 10,3 ± 0,3 m 
 | 
| Spinn | 7/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1966 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 132 | 
|---|---|
| neutrontal | 74 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,51 ± 0,11 h 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1960 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 133 | 
|---|---|
| neutrontal | 75 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 97 ± 4 m 
 | 
| Spinn | 1/2 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1951 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 134 | 
|---|---|
| neutrontal | 76 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,16 ± 0,04 d 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1951 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| ϵ (electron capture) | 100% | 
| masstal | 135 | 
|---|---|
| neutrontal | 77 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 17,7 ± 0,3 h 
 | 
| Spinn | 1/2 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1948 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 136 | 
|---|---|
| neutrontal | 78 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | 0,186 ± 0,002  
 | 
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1936 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| 2β+ (double β+ decay) | 
| masstal | 137 | 
|---|---|
| neutrontal | 79 | 
| Relative Atomic Mass | |
| g-factor | 0,64 ± 0,026666666666667  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 9 ± 0,3 h 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1948 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| masstal | 138 | 
|---|---|
| neutrontal | 80 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | 0,251 ± 0,002  
 | 
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1936 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| 2β+ (double β+ decay) | 
| masstal | 139 | 
|---|---|
| neutrontal | 81 | 
| Relative Atomic Mass | |
| g-factor | 0,70666666666667 ± 0,026666666666667  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 137,642 ± 0,02 d 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1948 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| ϵ (electron capture) | 100% | 
| masstal | 140 | 
|---|---|
| neutrontal | 82 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | 88,449 ± 0,051  
 | 
| radioaktivitet | stabil isotop | 
| Halveringstid | Not Radioactive ☢️ | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1925 | 
| Paritet | + | 
| masstal | 141 | 
|---|---|
| neutrontal | 83 | 
| Relative Atomic Mass | |
| g-factor | 0,31142857142857 ± 0,011428571428571  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 32,505 ± 0,01 d 
 | 
| Spinn | 7/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1948 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 142 | 
|---|---|
| neutrontal | 84 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | 11,114 ± 0,051  
 | 
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1925 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| α (α emission) | |
| 2β− (double β− decay) | 
| masstal | 143 | 
|---|---|
| neutrontal | 85 | 
| Relative Atomic Mass | |
| g-factor | 0,28666666666667 ± 0,0066666666666667  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 33,039 ± 0,006 h 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1948 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 144 | 
|---|---|
| neutrontal | 86 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 284,886 ± 0,025 d 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1945 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 145 | 
|---|---|
| neutrontal | 87 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 3,01 ± 0,06 m 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1954 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 146 | 
|---|---|
| neutrontal | 88 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 13,49 ± 0,16 m 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1953 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 147 | 
|---|---|
| neutrontal | 89 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 56,4 ± 1 s 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1964 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 148 | 
|---|---|
| neutrontal | 90 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 56,8 ± 0,3 s 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1964 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 149 | 
|---|---|
| neutrontal | 91 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 4,94 ± 0,04 s 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1974 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 150 | 
|---|---|
| neutrontal | 92 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 6,05 ± 0,07 s 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1970 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 151 | 
|---|---|
| neutrontal | 93 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 1,76 ± 0,06 s 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1997 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 152 | 
|---|---|
| neutrontal | 94 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 1,42 ± 0,02 s 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1990 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| masstal | 153 | 
|---|---|
| neutrontal | 95 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 865 ± 25 ms 
 | 
| Spinn | 3/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1994 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 154 | 
|---|---|
| neutrontal | 96 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 722 ± 14 ms 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 1994 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 155 | 
|---|---|
| neutrontal | 97 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 313 ± 7 ms 
 | 
| Spinn | 5/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 1994 | 
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 156 | 
|---|---|
| neutrontal | 98 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 233 ± 9 ms 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 2017 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 157 | 
|---|---|
| neutrontal | 99 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 175 ± 41 ms 
 | 
| Spinn | 7/2 | 
| nuclear quadrupole moment | |
| upptäcktsdatum | 2017 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 158 | 
|---|---|
| neutrontal | 100 | 
| Relative Atomic Mass | |
| g-factor | 0  
 | 
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | 99 ± 93 ms 
 | 
| Spinn | 0 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | 2016 | 
| Paritet | + | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | 100% | 
| β− n (β−-delayed neutron emission) | 
| masstal | 159 | 
|---|---|
| neutrontal | 101 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioaktivitet | ☢️ Radioaktivt grundämne | 
| Halveringstid | |
| Spinn | 1/2 | 
| nuclear quadrupole moment | 0  
 | 
| upptäcktsdatum | |
| Paritet | - | 
| decay mode | Intensitet | 
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) | 
| upptäckare eller uppfinnare | W. von Hisinger, J. Berzelius, M. Klaproth | 
|---|---|
| fyndplats | Sweden/Germany | 
| upptäcktsdatum | 1803 | 
| etymologi | Named after the asteroid, Ceres, discovered two years before the element. | 
| uttal | SER-i-em (engelska) | 
| Förekomst | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (världshav) | |
| natural abundance (människokropp) | |
| natural abundance (meteoroid) | 0,000075 % 
 | 
| natural abundance (Solen) | 0,0000004 % 
 | 
| Abundance in Universe | 0,000001 % 
 | 
| 1 | s | 1.1519 | 
| 2 | p | 4.2176 | 
| 2 | s | 15.26 | 
| 3 | d | 13.9147 | 
| 3 | p | 19.0405 | 
| 3 | s | 19.3408 | 
| 4 | d | 32.3392 | 
| 4 | f | 56.324 | 
| 4 | p | 29.3936 | 
| 4 | s | 28.32 | 
| 5 | p | 41.0345 | 
| 5 | s | 39.0865 | 
| 6 | s | 47.2036 |