Astatine (At)
Astatine is the 85th element in the periodic table and has a symbol of At and atomic number of 85. It has an atomic weight of (210) and a mass number of 191. Astatine has eighty-five protons and one hundred six neutrons in its nucleus, and eighty-five electrons in six shells. It is located in group seventeen, period six and block p of the periodic table. Radioactive halogen element. Occurs naturally from uranium and thorium decay. At least 20 known isotopes. At-210, the most stable, has a half-life of 8.3 hours. Synthesized by nuclear bombardment in 1940 by D.R. Corson, K.R. MacKenzie and E. Segre at the University of California.
| Atomic Number | 85 |
|---|---|
| Atomic Weight | 210 |
| Mass Number | 191 |
| Group | 17 |
|---|---|
| Period | 6 |
| Block | p |
| Protons | 85 p+ |
|---|---|
| Neutrons | 106 n0 |
| Electrons | 85 e- |
Physical Properties
Chemical Properties
| Energy | |
|---|---|
| Proton Affinity | |
| Electron Affinity | |
| Ionization Energy | |
| Heat of Vaporization | |
| Heat of Fusion | |
| Heat of Formation | |
| Electrons | |
| Electron Shells | 2, 8, 18, 32, 18, 7 |
 | |
| Valence Electrons | 7 ⓘ |
 | |
| Electron Configuration | [Xe] 4f14 5d10 6s2 6p5ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 4f14 5d10 6s2 6p5 |
  | |
| Oxidation States | -1, 1, 3, 5, 7 |
| Electronegativity |
2.2
|
| Electrophilicity Index | |
| States of Matter | |
| Phase | Solid |
| Gas Phase | |
| Boiling Point | |
| Melting Point | |
| Critical Pressure | |
| Critical Temperature | |
| Triple Point | |
| Visual | |
Astatine is a Silver. At has a CPK of #ff1493, Jmol of #754f45, and MOLCAS GV of #754f45. The Appearance of Element 85 is unknown, probably metallic. | |
| Color | Silver
|
| Appearance | unknown, probably metallic |
| Refractive Index | |
| Thermodynamic Properties | |
| Thermal Conductivity | |
| Thermal Expansion | |
| Molar Heat Capacity | |
| Specific Heat Capacity | |
| 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 lattice angles of Astatine is . | |
| Crystal Structure | () |
| Lattice Constant | |
| Lattice Angles | |
| Mechanical Properties | |
| Hardness | |
| Bulk Modulus | |
| Shear Modulus | |
| Young's Modulus | |
| Poisson Ratio | |
| Speed of Sound | |
| Classification | |
The CAS Group of Astatine is VIIB. The IUPAC Group of At is VIIA. The Glawe Number of Element 85 is 98. The Mendeleev Number of Astatine (At) is 110. The Pettifor Number of Astatine is 96. The Geochemical Class of At is U/Th decay series. The Goldschmidt Class of Element 85 is synthetic. | |
| Category | Halogens, Halogens |
| CAS Group | VIIB |
| IUPAC Group | VIIA |
| Glawe Number | 98 |
| Mendeleev Number | 110 |
| Pettifor Number | 96 |
| Geochemical Class | U/Th decay series |
| Goldschmidt Class | synthetic |
Other
The Dipole Polarizability of Astatine is 42 plus or minus 4 a₀. At has a C6 Dispersion Coefficient (GB) of 351 a₀. The Allotropes of Element 85 is . The Quantum Numbers of Astatine (At) is 2P3/2. The Space Group of Astatine is ().
| Gas Basicity | |
|---|---|
| Dipole Polarizability | |
| C6 Dispersion Coefficient | |
| Allotropes | |
| Neutron Cross Section | |
| Neutron Mass Absorption | |
| Quantum Numbers | 2P3/2 |
| Space Group | () |
Isotopes of Astatine
| Stable Isotopes | 0 |
|---|---|
| Unstable Isotopes | 39 |
| Natural Isotopes | 0 |
191At
| Mass Number | 191 |
|---|---|
| Neutron Number | 106 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 2.1 ± 0.8 ms
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2003 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
192At
| Mass Number | 192 |
|---|---|
| Neutron Number | 107 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 11.5 ± 0.6 ms
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 2006 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) | |
| β+ SF (β+-delayed fission) | 0.51% |
193At
| Mass Number | 193 |
|---|---|
| Neutron Number | 108 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 29 ± 5 ms
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2003 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
194At
| Mass Number | 194 |
|---|---|
| Neutron Number | 109 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 286 ± 7 ms
|
| Spin | 5 |
| Quadrupole Moment | |
| Discovery Year | 2009 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) | 8.3% |
| β+ SF (β+-delayed fission) | 0.032% |
195At
| Mass Number | 195 |
|---|---|
| Neutron Number | 110 |
| Relative Atomic Mass | |
| G-Factor | 3.2 ± 0.1
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 290 ± 20 ms
|
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 1999 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) |
196At
| Mass Number | 196 |
|---|---|
| Neutron Number | 111 |
| Relative Atomic Mass | |
| G-Factor | 1.24 ± 0.046666666666667
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 377 ± 4 ms
|
| Spin | 3 |
| Quadrupole Moment | -0.6 ± 0.4
|
| Discovery Year | 1967 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 97.5% |
| β+ (β+ decay; β+ = ϵ + e+) | |
| β+ SF (β+-delayed fission) | 0.009% |
197At
| Mass Number | 197 |
|---|---|
| Neutron Number | 112 |
| Relative Atomic Mass | |
| G-Factor | 0.85111111111111 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 388.2 ± 5.6 ms
|
| Spin | 9/2 |
| Quadrupole Moment | -1.2 ± 0.6
|
| Discovery Year | 1967 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 96.1% |
| β+ (β+ decay; β+ = ϵ + e+) | 3.9% |
198At
| Mass Number | 198 |
|---|---|
| Neutron Number | 113 |
| Relative Atomic Mass | |
| G-Factor | 1.34 ± 0.046666666666667
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 4.47 ± 0.05 s
|
| Spin | 3 |
| Quadrupole Moment | -0.6 ± 0.3
|
| Discovery Year | 1967 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 97% |
| β+ (β+ decay; β+ = ϵ + e+) |
199At
| Mass Number | 199 |
|---|---|
| Neutron Number | 114 |
| Relative Atomic Mass | |
| G-Factor | 0.87555555555556 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 7.02 ± 0.12 s
|
| Spin | 9/2 |
| Quadrupole Moment | -1 ± 0.5
|
| Discovery Year | 1967 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 89% |
| β+ (β+ decay; β+ = ϵ + e+) |
200At
| Mass Number | 200 |
|---|---|
| Neutron Number | 115 |
| Relative Atomic Mass | |
| G-Factor | 1.4266666666667 ± 0.05
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 43.2 ± 0.9 s
|
| Spin | 3 |
| Quadrupole Moment | -0.5 ± 0.5
|
| Discovery Year | 1963 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 52% |
| β+ (β+ decay; β+ = ϵ + e+) | 48% |
201At
| Mass Number | 201 |
|---|---|
| Neutron Number | 116 |
| Relative Atomic Mass | |
| G-Factor | 0.89111111111111 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 85.2 ± 1.6 s
|
| Spin | 9/2 |
| Quadrupole Moment | -1 ± 0.5
|
| Discovery Year | 1963 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 71% |
| β+ (β+ decay; β+ = ϵ + e+) | 29% |
202At
| Mass Number | 202 |
|---|---|
| Neutron Number | 117 |
| Relative Atomic Mass | |
| G-Factor | 1.38 ± 0.053333333333333
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 184 ± 1 s
|
| Spin | 3 |
| Quadrupole Moment | -0.5 ± 0.3
|
| Discovery Year | 1961 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 88% |
| α (α emission) | 12% |
203At
| Mass Number | 203 |
|---|---|
| Neutron Number | 118 |
| Relative Atomic Mass | |
| G-Factor | 0.88888888888889 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 7.4 ± 0.2 m
|
| Spin | 9/2 |
| Quadrupole Moment | -0.7 ± 0.4
|
| Discovery Year | 1951 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 69% |
| α (α emission) | 31% |
204At
| Mass Number | 204 |
|---|---|
| Neutron Number | 119 |
| Relative Atomic Mass | |
| G-Factor | 0.68857142857143 ± 0.025714285714286
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 9.12 ± 0.11 m
|
| Spin | 7 |
| Quadrupole Moment | -0.6 ± 0.3
|
| Discovery Year | 1961 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 96.2% |
| α (α emission) | 3.8% |
205At
| Mass Number | 205 |
|---|---|
| Neutron Number | 120 |
| Relative Atomic Mass | |
| G-Factor | 0.90888888888889 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 26.9 ± 0.8 m
|
| Spin | 9/2 |
| Quadrupole Moment | -0.6 ± 0.3
|
| Discovery Year | 1951 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 90% |
| α (α emission) | 10% |
206At
| Mass Number | 206 |
|---|---|
| Neutron Number | 121 |
| Relative Atomic Mass | |
| G-Factor | 0.72833333333333 ± 0.028333333333333
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 30.6 ± 0.8 m
|
| Spin | 6 |
| Quadrupole Moment | -0.4 ± 0.2
|
| Discovery Year | 1961 |
| Parity |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 99.1% |
| α (α emission) | 0.9% |
207At
| Mass Number | 207 |
|---|---|
| Neutron Number | 122 |
| Relative Atomic Mass | |
| G-Factor | 0.91777777777778 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 1.81 ± 0.03 h
|
| Spin | 9/2 |
| Quadrupole Moment | -0.5 ± 0.3
|
| Discovery Year | 1951 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 90% |
| α (α emission) | 10% |
208At
| Mass Number | 208 |
|---|---|
| Neutron Number | 123 |
| Relative Atomic Mass | |
| G-Factor | 0.74333333333333 ± 0.03
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 1.63 ± 0.03 h
|
| Spin | 6 |
| Quadrupole Moment | -0.4 ± 0.3
|
| Discovery Year | 1950 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 99.45% |
| α (α emission) | 0.55% |
209At
| Mass Number | 209 |
|---|---|
| Neutron Number | 124 |
| Relative Atomic Mass | |
| G-Factor | 0.91555555555556 ± 0.015555555555556
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 5.42 ± 0.05 h
|
| Spin | 9/2 |
| Quadrupole Moment | -0.4 ± 0.2
|
| Discovery Year | 1951 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 96.1% |
| α (α emission) | 3.9% |
210At
| Mass Number | 210 |
|---|---|
| Neutron Number | 125 |
| Relative Atomic Mass | |
| G-Factor | 0.944 ± 0.032
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 8.1 ± 0.4 h
|
| Spin | 5 |
| Quadrupole Moment | -0.4 ± 0.2
|
| Discovery Year | 1949 |
| Parity |
| Decay Mode | Intensity |
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 99.825% |
| α (α emission) | 0.175% |
211At
| Mass Number | 211 |
|---|---|
| Neutron Number | 126 |
| Relative Atomic Mass | |
| G-Factor | 0.92 ± 0.0088888888888889
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 7.214 ± 0.007 h
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1940 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| ϵ (electron capture) | 58.2% |
| α (α emission) | 41.8% |
212At
| Mass Number | 212 |
|---|---|
| Neutron Number | 127 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 314 ± 3 ms
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1954 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β+ (β+ decay; β+ = ϵ + e+) | |
| β− (β− decay) |
213At
| Mass Number | 213 |
|---|---|
| Neutron Number | 128 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 125 ± 6 ns
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1968 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
214At
| Mass Number | 214 |
|---|---|
| Neutron Number | 129 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 558 ± 10 ns
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1949 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
215At
| Mass Number | 215 |
|---|---|
| Neutron Number | 130 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 37 ± 3 us
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1944 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
216At
| Mass Number | 216 |
|---|---|
| Neutron Number | 131 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 300 ± 30 us
|
| Spin | 1 |
| Quadrupole Moment | |
| Discovery Year | 1948 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β− (β− decay) | |
| ϵ (electron capture) |
217At
| Mass Number | 217 |
|---|---|
| Neutron Number | 132 |
| Relative Atomic Mass | |
| G-Factor | 0.84444444444444 ± 0.044444444444444
|
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 32.6 ± 0.3 ms
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1947 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 99.992% |
| β− (β− decay) | 0.008% |
218At
| Mass Number | 218 |
|---|---|
| Neutron Number | 133 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 1.28 ± 0.06 s
|
| Spin | 2 |
| Quadrupole Moment | |
| Discovery Year | 1943 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 100% |
| β− (β− decay) |
219At
| Mass Number | 219 |
|---|---|
| Neutron Number | 134 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 56 ± 3 s
|
| Spin | 9/2 |
| Quadrupole Moment | |
| Discovery Year | 1953 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| α (α emission) | 93.6% |
| β− (β− decay) | 6.4% |
220At
| Mass Number | 220 |
|---|---|
| Neutron Number | 135 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 3.71 ± 0.04 m
|
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 1989 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 92% |
| α (α emission) | 8% |
221At
| Mass Number | 221 |
|---|---|
| Neutron Number | 136 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 2.3 ± 0.2 m
|
| Spin | 3/2 |
| Quadrupole Moment | |
| Discovery Year | 1989 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
222At
| Mass Number | 222 |
|---|---|
| Neutron Number | 137 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 54 ± 10 s
|
| Spin | |
| Quadrupole Moment | |
| Discovery Year | 1989 |
| Parity |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
223At
| Mass Number | 223 |
|---|---|
| Neutron Number | 138 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 50 ± 7 s
|
| Spin | 3/2 |
| Quadrupole Moment | |
| Discovery Year | 1989 |
| Parity | - |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
| α (α emission) |
224At
| Mass Number | 224 |
|---|---|
| Neutron Number | 139 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | 2.5 ± 1.5 m
|
| Spin | 2 |
| Quadrupole Moment | |
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | 100% |
225At
| Mass Number | 225 |
|---|---|
| Neutron Number | 140 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | |
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) |
226At
| Mass Number | 226 |
|---|---|
| Neutron Number | 141 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | |
| Spin | 2 |
| Quadrupole Moment | |
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) |
227At
| Mass Number | 227 |
|---|---|
| Neutron Number | 142 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | |
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) |
228At
| Mass Number | 228 |
|---|---|
| Neutron Number | 143 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | |
| Spin | 3 |
| Quadrupole Moment | |
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) |
229At
| Mass Number | 229 |
|---|---|
| Neutron Number | 144 |
| Relative Atomic Mass | |
| G-Factor | |
| Abundance | |
| Radioactivity | ☢️ Radioactive |
| Half Life | |
| Spin | 1/2 |
| Quadrupole Moment | 0
|
| Discovery Year | 2010 |
| Parity | + |
| Decay Mode | Intensity |
|---|---|
| β− (β− decay) | |
| β− n (β−-delayed neutron emission) |
History
In 1869, existence of astatine was first predicted by Russian chemist Dmitri Mendeleev and called the element eka-iodine. In 1940, Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè isolated the element at the University of California, Berkeley. Instead of searching for the element in nature, the scientists created it by bombarding bismuth-209 with alpha particles. From the Greek astatos meaning unstable
| Discoverers | D.R.Corson, K.R.MacKenzie, E.Segré |
|---|---|
| Discovery Location | United States |
| Discovery Year | 1940 |
| Etymology (Name Origin) | Greek: astatos (unstable). |
| Pronunciation | AS-teh-teen (English) |
Astatine is highly radioactive
Astatine is preferentially concentrated in the thyroid gland
Uses
The newly formed astatine-211 is important in nuclear medicine. Once produced, astatine must be used quickly, as it decays with a half-life of 7.2 hours. Astatine-211 can be used for targeted alpha particle radiotherapy, since it decays either via emission of an alpha particle. Since its isotopes have such short half-lives there are no commercially significant compounds of astatine.
Sources
Does not occur in nature. Similar to iodine. Produced by bombarding bismuth with alpha particles.
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| Natural Abundance (Oceans) | |
| Natural Abundance (Human Body) | 0 %
|
| Natural Abundance (Meteor) | 0 %
|
| Natural Abundance (Sun) | |
| Abundance in Universe | 0 %
|
Nuclear Screening Constants
| 1 | s | 1.6446 |
| 2 | p | 4.5524 |
| 2 | s | 22.3324 |
| 3 | d | 13.4155 |
| 3 | p | 23.5024 |
| 3 | s | 24.6481 |
| 4 | d | 37.9504 |
| 4 | f | 37.7596 |
| 4 | p | 36.516 |
| 4 | s | 35.6644 |
| 5 | d | 58.661 |
| 5 | p | 53.96 |
| 5 | s | 52.0665 |
| 6 | p | 69.8368 |
| 6 | s | 67.7002 |
Also Known As
- At
- element 85
Translations
- Italianastato
- Norwegian Bokmålastat
- Frenchastate
- GermanAstat
- Spanishástato
- Norwegian Nynorskastat
- Hungarianasztácium
- Portugueseastato
- Amharicአስታታይን
- AragoneseAstato
- Arabicأستاتين
- AzerbaijaniAstat
- BashkirАстат
- BelarusianАстат
- Bulgarianастатий
- Banglaএস্টাটিন
- Bosnianastat
- Catalanàstat
- CorsicanAstatu
- Czechastat
- ChuvashАстат
- WelshAstatin
- Danishastat
- Greekάστατο
- Esperantoastato
- EstonianAstaat
- Basqueastato
- Persianآستاتین
- Finnishastatiini
- FriulianAstat
- IrishAstaitín
- Galicianástato
- Manxastatçheen
- Hakka Chineseastatine
- Hebrewאסטטין
- Fiji HindiAstatine
- CroatianAstat
- Armenianաստատ
- InterlinguaAstato
- Indonesianastatin
- IdoAstato
- Icelandicastat
- Japaneseアスタチン
- Lojbanklirlxastati
- JavaneseAstatin
- KazakhАстат
- Kannadaಆಸ್ಟಟೈನ್
- Korean아스타틴
- KomiАстат
- Latinastatum
- LuxembourgishAstat
- LigurianAstö
- LithuanianAstatis
- Latvianastats
- Malayalamആസ്റ്ററ്റീൻ
- Mongolianастат
- Marathiएस्टाटाइन
- Western MariАстат
- MalayAstatin
- Burmeseအက်စ်တက်တိုင်း
- Mazanderaniاستاتین
- Low GermanAstat
- Dutchastaat
- OccitanAstat
- Polishastat
- Western Panjabiایسٹاٹین
- QuechuaAstatu
- Romanianastatin
- Russianастат
- Sicilianastatu
- Serbo-CroatianAstat
- Slovakastát
- SlovenianAstat
- AlbanianAstati
- Serbianастат
- Saterland FrisianAstat
- Swedishastat
- SwahiliAstatini
- Thaiแอสทาทีน
- TagalogAstatino
- Turkishastatin
- TatarАстат
- Uyghurئاستاتىن
- Ukrainianастат
- Urduعیسٹاٹین
- VepsAstat
- Vietnameseastatin
- WarayAstato
- KalmykАстатум
- YorubaAstatínì
- Chinese砹
- English (Canada)Astatine
- English (United Kingdom)astatine
- Chinese (China)砹
- Chinese (Simplified)砹
- Chinese (Traditional)砈
- Portuguese (Brazil)astato
- Chinese (Taiwan)砈
- Chinese (Singapore)砹
- Chinese (Macao SAR China)砹
- Chinese (Hong Kong SAR China)砈
- Chinese (Malaysia)砹
- Georgianასტატი
- CebuanoAstato
- UzbekAstat
- Central Kurdishئەستاتین
- Macedonianастат
- Punjabiਐਸਟਾਟੀਨ
- BretonAstat
- Tamilஅஸ்டடைன்
- Odiaଆଷ୍ଟାଟାଇନ
- Gujaratiએસ્ટાટીન
- PiedmonteseAstat
- Cantonese砹
- Afrikaansastaat
- ErzyaАстат
- SomaliAstatiin
- Belarusian (Taraskievica orthography)астат
- Hindiऐस्टाटीन
- Newariएस्टाटिन
- AromanianAstatiniu
- KyrgyzАстат
- TajikАстат
- FaroeseAstat
- Teluguఆస్టాటీన్
- Sanskritएस्टाटिन
- Malteseastatina
- AsturianAstatu
- Scottish GaelicAstatain
- LombardAstato
- Nepaliएस्टाटिन
- Gan Chinese砹
- Paliएस्टाटिन
- cdoAstatine
- Min Nan ChineseAstatine
- Bhojpuriएस्टाटिन
- Tibetanཨསེ་ཊེ་ཊིན།
- Lingua Franca Novaastato
- kbpAstatɩ
- Literary Chinese砈
- Northern FrisianAstaat
- oloAstattu
- Volapüklastatin
- Wu Chinese砹
- SardinianÀstatu
- KotavaKrepayot (Erythrogonys)
- Moroccan Arabicآسطاط
- Egyptian Arabicاستاتين
- Pashtoآستاتين
- BikolAstato
- CornishAstatin
- BalineseAstatin
- ZuluIsAtsha
