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^-

Properties

Physical Properties
Atomic Radius	247 pm
Molar Volume
Covalent Radius	147 pm 138 pm 138 pm 150 pm
Metallic Radius
Ionic Radius	62 pm
Crystal Radius	76 pm
Van der Waals Radius	202 pm 251 pm 202 pm 475 pm
Density	7 g/cm³
Energy
Proton Affinity
Electron Affinity	2.8 eV/particle
Ionization Energy	9.31751 eV/particle 17.88 eV/particle 26.58 eV/particle 39.65 eV/particle 50.39 eV/particle 72 eV/particle 85.1 eV/particle 130.1 eV/particle 149 eV/particle 169 eV/particle 192.1 eV/particle 212 eV/particle 236 eV/particle 263 eV/particle 287 eV/particle 311 eV/particle 335 eV/particle 452 eV/particle 481 eV/particle 510 eV/particle 540 eV/particle 600 eV/particle 630 eV/particle 720 eV/particle 750 eV/particle 790 eV/particle 860 eV/particle 920 eV/particle 990 eV/particle 1,050 eV/particle 1,120 eV/particle 1,180 eV/particle 1,250 eV/particle 1,320 eV/particle 1,380 eV/particle 1,450 eV/particle 1,510 eV/particle 1,590 eV/particle 1,650 eV/particle 1,948 eV/particle 2,007 eV/particle 2,071 eV/particle 2,139 eV/particle 2,203 eV/particle 2,266 eV/particle 2,373 eV/particle 2,439 eV/particle 2,510 eV/particle 2,576 eV/particle 2,841 eV/particle 2,905 eV/particle 2,977 eV/particle 3,042 eV/particle 3,312 eV/particle 3,388 eV/particle 3,573 eV/particle 3,649 eV/particle 5,980 eV/particle 6,122 eV/particle 6,279 eV/particle 6,445 eV/particle 6,604 eV/particle 6,759 eV/particle 7,068 eV/particle 7,230 eV/particle 7,410 eV/particle 7,570 eV/particle 8,030 eV/particle 8,180 eV/particle 8,330 eV/particle 8,480 eV/particle 9,330 eV/particle 9,500 eV/particle 9,830 eV/particle 9,990 eV/particle 21,210 eV/particle 21,600 eV/particle 22,030 eV/particle 22,420 eV/particle 25,580 eV/particle 26,080 eV/particle 26,730 eV/particle 27,139 eV/particle 107,923.4 eV/particle 109,886 eV/particle

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	14.1 eV/particle 0.19131 2.2
Electrophilicity Index	2.8161454412824063 eV/particle
States of Matter
Phase	Solid
Gas Phase
Boiling Point
Melting Point	575.15 K
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 #ff1493 #754f45 #754f45
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	42 ± 4 a₀
C6 Dispersion Coefficient	351 a₀
Allotropes
Neutron Cross Section
Neutron Mass Absorption
Quantum Numbers	2P3/2
Space Group	()

Isotopes of Astatine

Stable Isotopes	0
Unstable Isotopes	39
Radioactive Isotopes	39

¹⁹¹At

Mass Number	191
Neutron Number	106
Relative Atomic Mass	191.004148081 ± 0.000017287 Da
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	192.003140912 ± 0.000029922 Da
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	192.999927725 ± 0.000023222 Da
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	193.999230816 ± 0.00002523 Da
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	194.99627448 ± 0.000010276 Da
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	195.995799034 ± 0.000032458 Da
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	196.993177353 ± 0.00000857 Da
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	197.992797864 ± 0.000005265 Da
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	198.990527715 ± 0.00000578 Da
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	199.990351099 ± 0.000026264 Da
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	200.988417058 ± 0.000008786 Da
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	201.988625686 ± 0.000029631 Da
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	202.986942904 ± 0.000011404 Da
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	203.987251393 ± 0.000024335 Da
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	204.986060546 ± 0.000012941 Da
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	205.986645768 ± 0.000014523 Da
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	206.985799715 ± 0.000013318 Da
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	207.986613011 ± 0.000009577 Da
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	208.986168701 ± 0.000005094 Da
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	209.987147423 ± 0.000008261 Da
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	210.987496226 ± 0.000002929 Da
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	211.990737301 ± 0.000002559 Da
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	212.992936593 ± 0.000005258 Da
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	213.996372331 ± 0.000004274 Da
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	214.998651002 ± 0.000007116 Da
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	216.002422643 ± 0.000003837 Da
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	217.004717794 ± 0.000005368 Da
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	218.008695941 ± 0.000012349 Da
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	219.011160587 ± 0.000003474 Da
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	220.015433 ± 0.000015 Da
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	221.018017 ± 0.000015 Da
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	222.022494 ± 0.000017 Da
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	223.025151 ± 0.000015 Da
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	224.029749 ± 0.000024 Da
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	225.032528 ± 0.000322 Da
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	226.037209 ± 0.000322 Da
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	227.040183 ± 0.000322 Da
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	228.04496 ± 0.000429 Da
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	229.048191 ± 0.000429 Da
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
pnbایسٹاٹین
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
bclAstato
CornishAstatin
BalineseAstatin
ZuluIsAtsha

Astatine on ChemicalAid

Australian Educational Vocabulary ID	scot/1850
Brockhaus Enzyklopädie online ID	astat
CAS Registry Number	7440-68-8
ChEBI ID	30415
DSSTOX compound identifier	DTXCID40147882
DSSTox substance ID	DTXSID40225391
Den Store Danske ID	astat
Encyclopedia of China ID (Second Edition)	191040
Encyclopædia Universalis ID	astate
FAST ID	819270
Freebase ID	/m/027t9kn
GND ID	4143236-8
Gran Enciclopèdia Catalana ID	0005881
Great Russian Encyclopedia Online ID	1835401
InChI	InChI=1S/At
InChIKey	RYXHOMYVWAEKHL-UHFFFAOYSA-N
KBpedia ID	Astatine
Library of Congress authority ID	sh85008844
MeSH descriptor ID	D001246
Namuwiki ID	아스타틴
National Library of Israel J9U ID	987007294954905171
OmegaWiki Defined Meaning	155974
OpenAlex ID	C531082785
PSH ID	5815
PubChem CID	5460479
Quora topic ID	Astatine
Semantic Scholar topic ID	992086
Store norske leksikon ID	astat
Treccani ID	astato
USGS Thesaurus ID	1398
WordNet 3.1 Synset ID	14653739-n
YSO ID	28791

Astatine (At)

Properties

Isotopes of Astatine

191At

192At

193At

194At

195At

196At

197At

198At

199At

200At

201At

202At

203At

204At

205At

206At

207At

208At

209At

210At

211At

212At

213At

214At

215At

216At

217At

218At

219At

220At

221At

222At

223At

224At

225At

226At

227At

228At

229At