Actinium (Ac)
Actinium is the 89th element in the periodic table and has a symbol of Ac and atomic number of 89. It has an atomic weight of (227) and a mass number of 205. Actinium has eighty-nine protons and one hundred sixteen neutrons in its nucleus, and eighty-nine electrons in seven shells. It is located in group three, period seven and block d of the periodic table. Silvery radioactive metallic element, belongs to group 3 of the periodic table. The most stable isotope, Ac-227, has a half-life of 217 years. Ac-228 (half-life of 6.13 hours) also occurs in nature. There are 22 other artificial isotopes, all radioactive and having very short half-lives. Chemistry similar to lanthanumpy. Used as a source of alpha particles. Discovered by A. Debierne in 1899.
| Atomic Number | 89 |
|---|---|
| Atomic Weight | 227 |
| Mass Number | 205 |
| Group | 3 |
|---|---|
| Period | 7 |
| Block | d |
| Protons | 89 p+ |
|---|---|
| Neutrons | 116 n0 |
| Electrons | 89 e- |
Physical Properties
| Atomic Radius | 195 pm
|
|---|---|
| Molar Volume | 22.54 cm³/mol
|
| Covalent Radius | 186 pm
|
| Metallic Radius | |
| Ionic Radius | 112 pm
|
| Crystal Radius | 126 pm
|
| Van der Waals Radius |
247 pm
|
| Density | 10 g/cm³
|
Chemical Properties
| Energy | |
|---|---|
| Proton Affinity | |
| Electron Affinity | 0.35 eV/particle
|
| Ionization Energy | 5.380226 eV/particle
|
| Heat of Vaporization | 292.9 kJ/mol
|
| Heat of Fusion | 10.5 kJ/mol
|
| Heat of Formation | 406 kJ/mol
|
| Electrons | |
| Electron Shells | 2, 8, 18, 32, 18, 9, 2 |
 | |
| Valence Electrons | 2 ⓘ |
 | |
| Electron Configuration | [Rn] 6d1 7s2ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 6d1 7s2 |
  | |
| Oxidation States | 2, 3 |
| Electronegativity |
1.1
|
| Electrophilicity Index | 0.8159546412794374 eV/particle
|
| States of Matter | |
| Phase | Solid |
| Gas Phase | |
| Boiling Point | 3,473.15 K
|
| Melting Point | 1,323.15 K
|
| Critical Pressure | |
| Critical Temperature | |
| Triple Point | |
| Visual | |
Actinium is a Silver. Ac has a CPK of #ffffff, Jmol of #70abfa, and MOLCAS GV of #70abfa. | |
| Color | Silver
|
| Appearance | |
| Refractive Index | |
| Thermodynamic Properties | |
| Thermal Conductivity | |
| Thermal Expansion | |
| Molar Heat Capacity | 27.2 J/(mol K)
|
| Specific Heat Capacity | 0.12 J/(g⋅K)
|
| Heat Capacity Ratio (Adiabatic Index) | |
| Electrical Properties | |
| Type | |
| Electrical Conductivity | |
| Electrical Resistivity | |
| Superconducting Point | |
| Magnetism | |
| Type | |
| Magnetic Susceptibility (Mass) | |
| Magnetic Susceptibility (Molar) | |
| Magnetic Susceptibility (Volume) | |
| Magnetic Ordering | |
| Curie Point | |
| Neel Point | |
| Structure | |
The Crystal Structure of Actinium is FCC. The lattice constant of Ac is 5.31 Å. The lattice angles of Element 89 are π/2, π/2, π/2. | |
| Crystal Structure | Face Centered Cubic (FCC) |
| Lattice Constant | 5.31 Å
|
| Lattice Angles | π/2, π/2, π/2 |
| Mechanical Properties | |
| Hardness | |
| Bulk Modulus | |
| Shear Modulus | |
| Young's Modulus | |
| Poisson Ratio | |
| Speed of Sound | |
| Classification | |
The CAS Group of Actinium is IIIA. The IUPAC Group of Ac is IIIB. The Glawe Number of Element 89 is 33. The Mendeleev Number of Actinium (Ac) is 14. The Pettifor Number of Actinium is 48. The Geochemical Class of Ac is U/Th decay series. The Goldschmidt Class of Element 89 is synthetic. | |
| Category | Actinides, Actinides |
| CAS Group | IIIA |
| IUPAC Group | IIIB |
| Glawe Number | 33 |
| Mendeleev Number | 14 |
| Pettifor Number | 48 |
| Geochemical Class | U/Th decay series |
| Goldschmidt Class | synthetic |
Other
The Dipole Polarizability of Actinium is 203 plus or minus 12 a₀. The Allotropes of Ac is . The Neutron Cross Section of Element 89 is 880. The Neutron Mass Absorption of Actinium (Ac) is 0.078. The Quantum Numbers of Actinium is 2D3/2. The Space Group of Ac is 225 (Fm_3m).
| Gas Basicity | |
|---|---|
| Dipole Polarizability | |
| C6 Dispersion Coefficient | |
| Allotropes | |
| Neutron Cross Section | 880
|
| Neutron Mass Absorption | 0.078
|
| Quantum Numbers | 2D3/2 |
| Space Group | 225 (Fm_3m) |
Isotopes of Actinium
| Stable Isotopes | 0 |
|---|---|
| Unstable Isotopes | 33 |
| Natural Isotopes | 0 |
205Ac
| Mass Number | 205 |
|---|---|
| Neutron Number | 116 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 80 ± 60 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 2014 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
206Ac
| Mass Number | 206 |
|---|---|
| Neutron Number | 117 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 25 ± 7 ms
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 1998 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
207Ac
| Mass Number | 207 |
|---|---|
| Neutron Number | 118 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 31 ± 8 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1994 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
208Ac
| Mass Number | 208 |
|---|---|
| Neutron Number | 119 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 97 ± 15 ms
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 1994 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
209Ac
| Mass Number | 209 |
|---|---|
| Neutron Number | 120 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 94 ± 10 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
210Ac
| Mass Number | 210 |
|---|---|
| Neutron Number | 121 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 350 ± 40 ms
|
| Spin | 7 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
211Ac
| Mass Number | 211 |
|---|---|
| Neutron Number | 122 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 213 ± 25 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
212Ac
| Mass Number | 212 |
|---|---|
| Neutron Number | 123 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 895 ± 28 ms
|
| Spin | 7 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
213Ac
| Mass Number | 213 |
|---|---|
| Neutron Number | 124 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 738 ± 16 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
214Ac
| Mass Number | 214 |
|---|---|
| Neutron Number | 125 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 8.2 ± 0.2 s
|
| Spin | 5 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 93% |
| β+ (β+ decay; β+ = ϵ + e+) | 7% |
215Ac
| Mass Number | 215 |
|---|---|
| Neutron Number | 126 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 171 ± 10 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) | 0.09% |
216Ac
| Mass Number | 216 |
|---|---|
| Neutron Number | 127 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 440 ± 16 us
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1967 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
217Ac
| Mass Number | 217 |
|---|---|
| Neutron Number | 128 |
| Relative Atomic Mass | |
| G-Factor | 0.85111111111111 ± 0.011111111111111
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 69 ± 4 ns
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1972 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
218Ac
| Mass Number | 218 |
|---|---|
| Neutron Number | 129 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 1 ± 0.04 us
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1970 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
219Ac
| Mass Number | 219 |
|---|---|
| Neutron Number | 130 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 9.4 ± 1 us
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1970 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
220Ac
| Mass Number | 220 |
|---|---|
| Neutron Number | 131 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 26.36 ± 0.19 ms
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 1970 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
221Ac
| Mass Number | 221 |
|---|---|
| Neutron Number | 132 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 52 ± 2 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
222Ac
| Mass Number | 222 |
|---|---|
| Neutron Number | 133 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 5 ± 0.5 s
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1949 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 99% |
| β+ (β+ decay; β+ = ϵ + e+) | 1% |
223Ac
| Mass Number | 223 |
|---|---|
| Neutron Number | 134 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 2.1 ± 0.05 m
|
| Spin | 5/2 |
| Quadrupole Moment | |
| Discovery Year | 1948 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 99% |
| ϵ (electron capture) |
224Ac
| Mass Number | 224 |
|---|---|
| Neutron Number | 135 |
| Relative Atomic Mass | |
| G-Factor | 0
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 2.78 ± 0.16 h
|
| Spin | 0 |
| Quadrupole Moment | 0
|
| Discovery Year | 1948 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 90.5% |
| α (α emission) | 9.5% |
| β− (β− decay) |
225Ac
| Mass Number | 225 |
|---|---|
| Neutron Number | 136 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 9.919 ± 0.0021 d
|
| Spin | 3/2 |
| Quadrupole Moment | |
| Discovery Year | 1947 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| 14C | 5.3% |
226Ac
| Mass Number | 226 |
|---|---|
| Neutron Number | 137 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 29.37 ± 0.12 h
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1950 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 83% |
| ϵ (electron capture) | 17% |
| α (α emission) | 0.006% |
227Ac
| Mass Number | 227 |
|---|---|
| Neutron Number | 138 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 21.772 ± 0.003 y
|
| Spin | 3/2 |
| Quadrupole Moment | |
| Discovery Year | 1851 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 98.62% |
| α (α emission) | 1.38% |
228Ac
| Mass Number | 228 |
|---|---|
| Neutron Number | 139 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 6.15 ± 0.02 h
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 1908 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
229Ac
| Mass Number | 229 |
|---|---|
| Neutron Number | 140 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 62.7 ± 0.5 m
|
| Spin | 3/2 |
| Quadrupole Moment | |
| Discovery Year | 1952 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
230Ac
| Mass Number | 230 |
|---|---|
| Neutron Number | 141 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 122 ± 3 s
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1973 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
| β− SF (β−-delayed fission) | 1.2% |
231Ac
| Mass Number | 231 |
|---|---|
| Neutron Number | 142 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 7.5 ± 0.1 m
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 1973 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
232Ac
| Mass Number | 232 |
|---|---|
| Neutron Number | 143 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 1.98 ± 0.08 m
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1986 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
233Ac
| Mass Number | 233 |
|---|---|
| Neutron Number | 144 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 143 ± 10 s
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 1983 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
234Ac
| Mass Number | 234 |
|---|---|
| Neutron Number | 145 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 45 ± 2 s
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1986 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
235Ac
| Mass Number | 235 |
|---|---|
| Neutron Number | 146 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 62 ± 4 s
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2006 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
236Ac
| Mass Number | 236 |
|---|---|
| Neutron Number | 147 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 4.5 ± 3.6 m
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
History
André-Louis Debierne, a French chemist, discovered actinium in 1899. He separated it from pitchblende residues left by Marie and Pierre Curie after they had extracted radium. Friedrich Oskar Giesel independently discovered actinium in 1902 as a substance being similar to lanthanum. From the Greek aktis, aktinos, meaning beam or ray
| Discoverers | André Debierne |
|---|---|
| Discovery Location | France |
| Discovery Year | 1899 |
| Etymology (Name Origin) | Greek: akis, aktinos (ray). |
| Pronunciation | ak-TIN-i-em (English) |
Actinium is highly radioactive
Actinium glows in the dark with a pale blue light
Uses
Actinium is used as an active element of radioisotope thermoelectric generators, for example in spacecraft. The medium half-life of 227Ac makes it very convenient radioactive isotope in modeling the slow vertical mixing of oceanic waters. 225Ac is applied in medicine to produce 213Bi in a reusable generator or can be used alone as an agent for radiation therapy. It has no significant commercial applications.
Sources
Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor.
| Abundance | |
|---|---|
| Abundance in Earth's crust | 0.00000000055 mg/kg
|
| Natural Abundance (Oceans) | |
| Natural Abundance (Human Body) | 0 %
|
| Natural Abundance (Meteor) | |
| Natural Abundance (Sun) | 0 %
|
| Abundance in Universe | 0 %
|
Nuclear Screening Constants
Also Known As
- Ac
- element 89
- emanium
- 89Ac
Translations
- Frenchactinium
- Italianattinio
- Norwegian Bokmålactinium
- GermanActinium
- Spanishactinio
- Dutchactinium
- Norwegian Nynorskactinium
- Danishactinium
- Swedishaktinium
- Portugueseactínio
- Afrikaansaktinium
- Amharicአክቲኒየም
- Arabicأكتينيوم
- AsturianActiniu
- AzerbaijaniAktinium
- Belarusianактыній
- Bulgarianактиний
- Banglaঅ্যাক্টিনিয়াম
- Bosnianaktinij
- Catalanactini
- CorsicanAttiniu
- Czechaktinium
- ChuvashАктини
- WelshActiniwm
- Greekακτίνιο
- Esperantoaktinio
- Estonianaktiinium
- Basqueaktinio
- Persianاکتینیم
- Finnishaktinium
- FriulianAtini
- Irishachtainiam
- Galicianactinio
- Manxaghtinnium
- Hebrewאקטיניום
- Hindiऐक्टिनियम
- Fiji HindiActinium
- Croatianaktinij
- Haitian CreoleAktiniòm
- Hungarianaktínium
- Armenianակտինիում
- Interlinguaactinium
- Indonesianaktinium
- Idoaktiniumo
- Japaneseアクチニウム
- Lojbanjinmrtaktini
- JavaneseAktinium
- KazakhАктиний
- Korean악티늄
- KomiАктиний
- Latinactinium
- LuxembourgishActinium
- LigurianAttinio
- Lithuanianaktinis
- Latvianaktīnijs
- Malayalamആക്റ്റിനിയം
- Mongolianактини
- Marathiअॅक्टिनियम
- Western MariАктиний
- MalayAktinium
- Burmeseအက်တီနီယမ်
- Low GermanActinium
- Newariएक्टिनियम
- Occitanactini
- Polishaktyn
- Western Panjabiایکٹینیم
- QuechuaAktinyu
- Romanianactiniu
- Russianактиний
- RusynАктіній
- YakutАктиниум
- Sicilianattiniu
- Serbo-CroatianAktinijum
- Slovakaktínium
- Slovenianaktinij
- Albanianaktiniumi
- Serbianактинијум
- Saterland FrisianAktinium
- Tamilஅக்டினியம்
- Thaiแอกทิเนียม
- TagalogAktinyo
- Turkishaktinyum
- Uyghurئاكتىنىي
- Ukrainianактиній
- Urduعیکٹنیئم
- VepsAktinii
- Vietnameseactini
- WarayActinyo
- KalmykАктиниум
- YorubaÀktíníọ̀m
- Chinese锕
- Georgianაქტინიუმი
- CebuanoActinyo
- BretonAktiniom
- Central Kurdishئەکتینیۆم
- Odiaଆକ୍ଟିନିଅମ
- Gujaratiએક્ટિનીયમ
- Macedonianактиниум
- PiedmonteseActini
- TatarАктиний
- Kannadaಆಕ್ಟಿನಿಯಮ್
- Cantonese錒
- SomaliAktiiniyaam
- Belarusian (Taraskievica orthography)актын
- UzbekAktiniy
- Chinese (China)锕
- Chinese (Simplified)锕
- Chinese (Traditional)錒
- Chinese (Hong Kong SAR China)錒
- Chinese (Taiwan)錒
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