Astatium (At)

chemical element with symbol At and atomic number 85

Atomic Number	85
Atomic Weight	210
mass number	191

Group	17
Period	6
Block	p

proton	85 p⁺
neutron	106 n⁰
electron	85 e^-

Physical Property

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

Chemical Property

energia

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 1050 eV/particle 1120 eV/particle 1180 eV/particle 1250 eV/particle 1320 eV/particle 1380 eV/particle 1450 eV/particle 1510 eV/particle 1590 eV/particle 1650 eV/particle 1948 eV/particle 2007 eV/particle 2071 eV/particle 2139 eV/particle 2203 eV/particle 2266 eV/particle 2373 eV/particle 2439 eV/particle 2510 eV/particle 2576 eV/particle 2841 eV/particle 2905 eV/particle 2977 eV/particle 3042 eV/particle 3312 eV/particle 3388 eV/particle 3573 eV/particle 3649 eV/particle 5980 eV/particle 6122 eV/particle 6279 eV/particle 6445 eV/particle 6604 eV/particle 6759 eV/particle 7068 eV/particle 7230 eV/particle 7410 eV/particle 7570 eV/particle 8030 eV/particle 8180 eV/particle 8330 eV/particle 8480 eV/particle 9330 eV/particle 9500 eV/particle 9830 eV/particle 9990 eV/particle 21210 eV/particle 21600 eV/particle 22030 eV/particle 22420 eV/particle 25580 eV/particle 26080 eV/particle 26730 eV/particle 27139 eV/particle 107923.4 eV/particle 109886 eV/particle

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
electron

Tegimen electronicum	2, 8, 18, 32, 18, 7

valence electron	7 ⓘ

electron configuration	[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁵ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁵

oxidation number	-1, 1, 3, 5, 7
electronegativity	14.1 eV/particle 0.19131 2.2
Electrophilicity Index	2.8161454412824063 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	575.15 K
critical pressure
critical temperature
Punctum triplex
appearance
Color	Silver #ff1493 #754f45 #754f45
appearance	unknown, probably metallic
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
Superconductrum
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	()
lattice constant
Lattice Angles
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
celeritas soni
classificare
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 classification	synthetic

other

Gas Basicity
polarizability	42 ± 4 a₀
C6 Dispersion Coefficient	351 a₀
allotrope
Neutron cross section
Neutron Mass Absorption
quantum number	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	191.004148081 ± 0.000017287 Da
g-factor
natural abundance
radioactivitas	☢️ radioactive element
half-life	2.1 ± 0.8 ms
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	11.5 ± 0.6 ms
Volubilitas	3
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	29 ± 5 ms
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	286 ± 7 ms
Volubilitas	5
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	290 ± 20 ms
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	377 ± 4 ms
Volubilitas	3
nuclear quadrupole moment	-0.6 ± 0.4
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	388.2 ± 5.6 ms
Volubilitas	9/2
nuclear quadrupole moment	-1.2 ± 0.6
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	4.47 ± 0.05 s
Volubilitas	3
nuclear quadrupole moment	-0.6 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	7.02 ± 0.12 s
Volubilitas	9/2
nuclear quadrupole moment	-1 ± 0.5
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	43.2 ± 0.9 s
Volubilitas	3
nuclear quadrupole moment	-0.5 ± 0.5
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	85.2 ± 1.6 s
Volubilitas	9/2
nuclear quadrupole moment	-1 ± 0.5
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	184 ± 1 s
Volubilitas	3
nuclear quadrupole moment	-0.5 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	7.4 ± 0.2 m
Volubilitas	9/2
nuclear quadrupole moment	-0.7 ± 0.4
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	9.12 ± 0.11 m
Volubilitas	7
nuclear quadrupole moment	-0.6 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	26.9 ± 0.8 m
Volubilitas	9/2
nuclear quadrupole moment	-0.6 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	30.6 ± 0.8 m
Volubilitas	6
nuclear quadrupole moment	-0.4 ± 0.2
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	1.81 ± 0.03 h
Volubilitas	9/2
nuclear quadrupole moment	-0.5 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	1.63 ± 0.03 h
Volubilitas	6
nuclear quadrupole moment	-0.4 ± 0.3
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	5.42 ± 0.05 h
Volubilitas	9/2
nuclear quadrupole moment	-0.4 ± 0.2
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	8.1 ± 0.4 h
Volubilitas	5
nuclear quadrupole moment	-0.4 ± 0.2
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	7.214 ± 0.007 h
Volubilitas	9/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	314 ± 3 ms
Volubilitas	1
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	125 ± 6 ns
Volubilitas	9/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	558 ± 10 ns
Volubilitas	1
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	37 ± 3 us
Volubilitas	9/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	300 ± 30 us
Volubilitas	1
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	32.6 ± 0.3 ms
Volubilitas	9/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	1.28 ± 0.06 s
Volubilitas	2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	56 ± 3 s
Volubilitas	9/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	3.71 ± 0.04 m
Volubilitas	3
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	2.3 ± 0.2 m
Volubilitas	3/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	54 ± 10 s
Volubilitas
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	50 ± 7 s
Volubilitas	3/2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life	2.5 ± 1.5 m
Volubilitas	2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life
Volubilitas	2
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life
Volubilitas	3
nuclear quadrupole moment
repertus	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
natural abundance
radioactivitas	☢️ radioactive element
half-life
Volubilitas	1/2
nuclear quadrupole moment	0
repertus	2010
parity	+

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)

historia

inventor	D.R.Corson, K.R.MacKenzie, E.Segré
location of discovery	United States
repertus	1940
Etymologia	Greek: astatos (unstable).
pronunciation	AS-teh-teen (English)

source

Abundance
Abundance in Earth's crust
natural abundance (Oceanus)
natural abundance (Corpus humanum)	0 %
natural abundance (Meteoroides)	0 %
natural abundance (Sol)
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

Astatium 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
Gran Enciclopèdia Catalana ID	0005881
Great Russian Encyclopedia Online ID	1835401
InChI	InChI=1S/At
InChIKey	RYXHOMYVWAEKHL-UHFFFAOYSA-N
KBpedia ID	Astatine
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
siglum Freebase	/m/027t9kn
siglum GND	4143236-8
siglum apud bibliothecam Congressús	sh85008844

Astatium (At)

Physical Property

Chemical Property

other

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

historia

source

Nuclear Screening Constants

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