Мышьяк (As)

chemical element with symbol As and atomic number 33

Atomic Number	33
Atomic Weight	74.921595
mass number	75

Group	15
Period	4
Block	p

Протон	33 p⁺
Нейтрон	42 n⁰
Электрон	33 e^-

Animated Атăмăн Бор моделĕ of As (Мышьяк)

Физикăлла Палăрăм

Атом Радиусĕ	115 pm 231 pm
molar volume	13,1 cm³/mol
Ковалентла радиус	121 pm 114 pm 106 pm 126 pm 119 pm
Metallic Radius	121 pm 148 pm
ionic radius	58 pm 33,5 pm 46 pm
Crystal Radius	72 pm 47,5 pm 60 pm
Van der Waals radius	205 pm 185 pm 415 pm 185 pm 236 pm 423 pm
density	5,75 g/cm³ 5 220 kg/m³

Chemical Property

Энерги

proton affinity
electron affinity	0,804 eV/particle
ionization energy	9,789 eV/particle 18,5892 eV/particle 28,349 eV/particle 50,15 eV/particle 62,767 eV/particle 121,19 eV/particle 147 eV/particle 180 eV/particle 213 eV/particle 247 eV/particle 296 eV/particle 333 eV/particle 375 eV/particle 418 eV/particle 460 eV/particle 587,6 eV/particle 628,82 eV/particle 672,9 eV/particle 728,9 eV/particle 774 eV/particle 814 eV/particle 911,7 eV/particle 956,791 eV/particle 2 357 eV/particle 2 486 eV/particle 2 626 eV/particle 2 766 eV/particle 2 938 eV/particle 3 088,1 eV/particle 3 287 eV/particle 3 411,643 eV/particle 14 447,6778 eV/particle 15 028,906 eV/particle

Пăсланнин тата конденсациленнин пайлавла ăшши	32,4 kJ/mol
Шăраннин пайлавла ăшши
standard enthalpy of formation	302,5 kJ/mol
Электрон

electron shell	2, 8, 18, 5

valence electron	5 ⓘ

electron configuration	[Ar] 3d¹⁰ 4s² 4p³ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³

Оксидлав капашĕ	-3, -2, -1, 0, 1, 2, 3, 4, 5
Электронегативлăх	13,08 eV/particle 0.2068208 2.18
Electrophilicity Index	1,5610969532554257 eV/particle
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point	889,15 K
Melting Point	1 090,15 K
critical pressure	22,3 MPa
critical temperature	1 673,15 K
Виççĕлле пăнчă	1 090,15 K 3 700 kPa
appearance
Тӗс	Silver #ff1493 #bd80e3 #bd80e3
appearance	metallic grey
Хуçăлу кăтартăшĕ	1,001552
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity	24,64 J/(mol K)
Specific Heat Capacity	0,329 J/(g⋅K)
heat capacity ratio
electrical properties
type	Conductor
electrical conductivity	3,3 MS/m
Пайлавла электро хирĕçтăру	0,0000003 Ω*m
superconductivity
Магнетизм
type	diamagnetic
magnetic susceptibility (Mass)	-0,0000000039 m³/Kg
magnetic susceptibility (Molar)	-0,000000000292 m³/mol
magnetic susceptibility (Volume)	-0,0000223
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal Structure	Simple Trigonal (RHL)
Решетке константти	4,13 Å
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness	1 440 MPa 3,5 MPa
bulk modulus	22 GPa
shear modulus
Юнг модулĕ	8 GPa
Poisson's ratio
Сасă хăвăртлăхĕ
classification
Category	Metalloids, Metalloids
CAS Group	VB
IUPAC Group	VA
Glawe Number	90
Mendeleev Number	95
Pettifor Number	89
Geochemical Class	semi-volatile
Goldschmidt classification	chalcophile

other

Gas Basicity
Поляризациленеслĕх	30 ± 1 a₀
C6 Dispersion Coefficient	246 a₀ 260 a₀
allotrope	Yellow Arsenic, Black Arsenic, Gray Arsenic
Neutron cross section	4,2
Neutron Mass Absorption	0,002
quantum number	4S3/2
space group	166 (R_3m)

Isotopes of Arsenic

Stable Isotopes	1
Unstable Isotopes	32
Natural Isotopes	1

⁶⁰As

mass number	60
neutron number	27
Relative Atomic Mass	59,993945 ± 0,000429 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	5
nuclear quadrupole moment
time of discovery or invention
Ыт-тĕкел (физика)	+

decay mode	intensity
p (proton emission)

⁶¹As

mass number	61
neutron number	28
Relative Atomic Mass	60,981535 ± 0,000322 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	3/2
nuclear quadrupole moment
time of discovery or invention
Ыт-тĕкел (физика)	-

decay mode	intensity
p (proton emission)

⁶²As

mass number	62
neutron number	29
Relative Atomic Mass	61,973784 ± 0,000322 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	1
nuclear quadrupole moment
time of discovery or invention
Ыт-тĕкел (физика)	+

decay mode	intensity
p (proton emission)

⁶³As

mass number	63
neutron number	30
Relative Atomic Mass	62,964036 ± 0,000215 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	3/2
nuclear quadrupole moment
time of discovery or invention
Ыт-тĕкел (физика)	-

decay mode	intensity
p (proton emission)

⁶⁴As

mass number	64
neutron number	31
Relative Atomic Mass	63,95756 ± 0,000218 Da
g-factor	0
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	69 ± 1,4 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1995
Ыт-тĕкел (физика)	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)

⁶⁵As

mass number	65
neutron number	32
Relative Atomic Mass	64,949611 ± 0,000091 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	130,3 ± 0,6 ms
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1991
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%
β⁺ p (β⁺-delayed proton emission)

⁶⁶As

mass number	66
neutron number	33
Relative Atomic Mass	65,944148778 ± 0,0000061 Da
g-factor	0
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	95,77 ± 0,23 ms
spin	0
nuclear quadrupole moment	0
time of discovery or invention	1978
Ыт-тĕкел (физика)	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁶⁷As

mass number	67
neutron number	34
Relative Atomic Mass	66,93925111 ± 0,000000475 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	42,5 ± 1,2 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1980
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁶⁸As

mass number	68
neutron number	35
Relative Atomic Mass	67,936774127 ± 0,000001981 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	151,6 ± 0,8 s
spin	3
nuclear quadrupole moment
time of discovery or invention	1971
Ыт-тĕкел (физика)	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁶⁹As

mass number	69
neutron number	36
Relative Atomic Mass	68,932246289 ± 0,000034352 Da
g-factor	0,6488 ± 0,0008
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	15,2 ± 0,2 m
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1955
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷⁰As

mass number	70
neutron number	37
Relative Atomic Mass	69,930934642 ± 0,0000015 Da
g-factor	0,5276 ± 0,000125
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	52,6 ± 0,3 m
spin	4
nuclear quadrupole moment	0,09 ± 0,02
time of discovery or invention	1950
Ыт-тĕкел (физика)	+

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷¹As

mass number	71
neutron number	38
Relative Atomic Mass	70,927113594 ± 0,000004469 Da
g-factor	0,6692 ± 0,0008
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	65,3 ± 0,07 h
spin	5/2
nuclear quadrupole moment	-0,021 ± 0,006
time of discovery or invention	1939
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷²As

mass number	72
neutron number	39
Relative Atomic Mass	71,926752291 ± 0,000004383 Da
g-factor	-1,0805 ± 0,0003
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	26 ± 0,1 h
spin	2
nuclear quadrupole moment	-0,08 ± 0,02
time of discovery or invention	1939
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

⁷³As

mass number	73
neutron number	40
Relative Atomic Mass	72,923829086 ± 0,000004136 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	80,3 ± 0,06 d
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1948
Ыт-тĕкел (физика)	-

decay mode	intensity
ϵ (electron capture)	100%

⁷⁴As

mass number	74
neutron number	41
Relative Atomic Mass	73,923928596 ± 0,000001817 Da
g-factor	-0,798 ± 0,0015
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	17,77 ± 0,02 d
spin	2
nuclear quadrupole moment
time of discovery or invention	1938
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	66%
β⁻ (β⁻ decay)	34%

⁷⁵As

mass number	75
neutron number	42
Relative Atomic Mass	74,921594562 ± 0,000000948 Da
g-factor
natural abundance	100
Радиоактивлă аркану	stable isotope
Çурма аркану тапхăрĕ	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	0,311 ± 0,002
time of discovery or invention	1920
Ыт-тĕкел (физика)	-

⁷⁶As

mass number	76
neutron number	43
Relative Atomic Mass	75,922392011 ± 0,000000951 Da
g-factor	0,45115 ± 0,0005
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	1,0933 ± 0,0038 d
spin	2
nuclear quadrupole moment
time of discovery or invention	1934
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁷⁷As

mass number	77
neutron number	44
Relative Atomic Mass	76,920647555 ± 0,000001816 Da
g-factor	0,86266666666667 ± 0,00086666666666667
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	38,79 ± 0,05 h
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1951
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁷⁸As

mass number	78
neutron number	45
Relative Atomic Mass	77,921827771 ± 0,000010498 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	90,7 ± 0,2 m
spin	2
nuclear quadrupole moment
time of discovery or invention	1937
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁷⁹As

mass number	79
neutron number	46
Relative Atomic Mass	78,920948419 ± 0,000005716 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	9,01 ± 0,15 m
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1950
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸⁰As

mass number	80
neutron number	47
Relative Atomic Mass	79,92247444 ± 0,000003578 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	15,2 ± 0,2 s
spin	1
nuclear quadrupole moment
time of discovery or invention	1954
Ыт-тĕкел (физика)	+

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸¹As

mass number	81
neutron number	48
Relative Atomic Mass	80,922132288 ± 0,000002838 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	33,3 ± 0,8 s
spin	3/2
nuclear quadrupole moment
time of discovery or invention	1960
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸²As

mass number	82
neutron number	49
Relative Atomic Mass	81,924738731 ± 0,000004003 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	19,1 ± 0,5 s
spin	2
nuclear quadrupole moment
time of discovery or invention	1968
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸³As

mass number	83
neutron number	50
Relative Atomic Mass	82,9252069 ± 0,000003004 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	13,4 ± 0,4 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1968
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%

⁸⁴As

mass number	84
neutron number	51
Relative Atomic Mass	83,92930329 ± 0,000003403 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	3,16 ± 0,58 s
spin	2
nuclear quadrupole moment
time of discovery or invention	1968
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	0.28%

⁸⁵As

mass number	85
neutron number	52
Relative Atomic Mass	84,932163658 ± 0,000003304 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	2,022 ± 0,007 s
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1967
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	62.6%

⁸⁶As

mass number	86
neutron number	53
Relative Atomic Mass	85,936701532 ± 0,000003703 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	945 ± 8 ms
spin	1
nuclear quadrupole moment
time of discovery or invention	1973
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	35.5%
2n (2-neutron emission)

⁸⁷As

mass number	87
neutron number	54
Relative Atomic Mass	86,940291716 ± 0,000003204 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	492 ± 25 ms
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1970
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)	15.4%
2n (2-neutron emission)

⁸⁸As

mass number	88
neutron number	55
Relative Atomic Mass	87,94584 ± 0,000215 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ	270 ± 150 ms
spin
nuclear quadrupole moment
time of discovery or invention	1994
Ыт-тĕкел (физика)

decay mode	intensity
β⁻ (β⁻ decay)	100%
β⁻ n (β⁻-delayed neutron emission)

⁸⁹As

mass number	89
neutron number	56
Relative Atomic Mass	88,950048 ± 0,000322 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1994
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁹⁰As

mass number	90
neutron number	57
Relative Atomic Mass	89,955995 ± 0,000429 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin
nuclear quadrupole moment
time of discovery or invention	1997
Ыт-тĕкел (физика)

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁹¹As

mass number	91
neutron number	58
Relative Atomic Mass	90,960816 ± 0,000429 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin	5/2
nuclear quadrupole moment
time of discovery or invention	1997
Ыт-тĕкел (физика)	-

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

⁹²As

mass number	92
neutron number	59
Relative Atomic Mass	91,967386 ± 0,000537 Da
g-factor
natural abundance
Радиоактивлă аркану	☢️ radioactive element
Çурма аркану тапхăрĕ
spin
nuclear quadrupole moment
time of discovery or invention	1997
Ыт-тĕкел (физика)

decay mode	intensity
β⁻ (β⁻ decay)
β⁻ n (β⁻-delayed neutron emission)
2n (2-neutron emission)

истори

discoverer or inventor	Known to the ancients.
location of discovery
time of discovery or invention
etymology	Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment).
pronunciation	AR-s'n-ik (акӑлчан)

source

Abundance
Abundance in Earth's crust	1,8 mg/kg
natural abundance (океан)	0,0037 mg/L
natural abundance (Этем ӳт-пĕвĕ)	0,000005 %
natural abundance (meteoroid)	0,00018 %
natural abundance (Хĕвел)
Abundance in Universe	0,0000008 %

Nuclear Screening Constants

1	s	0.7217
2	p	3.9264
2	s	8.873
3	d	15.6216
3	p	15.1503
3	s	14.4045
4	p	25.5508
4	s	24.056

Мышьяк on ChemicalAid

Australian Educational Vocabulary ID	scot/1661
BNCF Thesaurus ID	25597
Banglapedia ID (Bengali)	আর্সেনিক
Bibliothèque nationale de France ID	11971740q
Brockhaus Enzyklopädie online ID	arsen
CAB ID	43961
CA PROP 65 ID	arsenic
CAS Registry Number	7440-38-2
ChEBI ID	27563
ChemSpider ID	4514330
DSSTOX compound identifier	DTXCID703886
DSSTox substance ID	DTXSID4023886
De Agostini ID	arsènico+(sostantivo)
Den Store Danske ID	arsen
ECHA Substance Infocard ID	100.028.316
Encyclopedia of China ID (Second Edition)	229020
Encyclopædia Universalis ID	arsenic-toxicologie
Encyclopædia Universalis ID	arsenic
Encyclopédie berbère article ID	2598
Freebase ID	/m/027rq1r
French Vikidia ID	Arsenic
GND ID	4003041-6
Gran Enciclopèdia Catalana ID	0005554
Great Russian Encyclopedia Online ID	2241159
Gujarati Vishwakosh entry	આર્સેનિક
HCIS ID	287
HSDB ID	509
ICSC ID	0013
InChI	InChI=1S/As
InChIKey	RQNWIZPPADIBDY-UHFFFAOYSA-N
KBpedia ID	Arsenic
KEGG ID	C06269
Krugosvet article	nauka_i_tehnika/himiya/MISHYAK.html
Krugosvet article	meditsina/myshyak-i-zdorove-cheloveka
Library of Congress authority ID	sh85007449
LiverTox ID	Arsenic
MeSH descriptor ID	D001151
NALT ID	12370
NDF-RT ID	N0000022206
NDL Authority ID	00563271
NE.se ID	arsenik
NKCR AUT ID	ph138910
National Library of Israel J9U ID	987007294803405171
National Library of Latvia ID	000306779
OmegaWiki Defined Meaning	255
OpenAlex ID	C502230775
OpenAlex ID	C2910930242
PACTOLS thesaurus ID	pcrt5mFxzmQ9rX
PM20 ware ID	142006
PSH ID	5803
PubChem CID	5359596
Quora topic ID	Arsenic-As
RxNorm ID	1111
Spanish Cultural Heritage thesauri ID	materias/1009757
Store medisinske leksikon ID	arsen
Store norske leksikon ID	arsen
Treccani ID	arsenico
U.S. National Archives Identifier	10637420
UK Archival Thesaurus ID	f2/mt225/4347/7620
UMLS CUI	C0003818
UNII	N712M78A8G
USGS Thesaurus ID	1396
WikiSkripta ID	32671
Wolfram Language entity code	Entity["Mineral", "Arsenic"]
WordNet 3.1 Synset ID	14653327-n
YSO ID	9329
ZVG number	8280

Мышьяк (As)

Физикăлла Палăрăм

Chemical Property

other

Isotopes of Arsenic

60As

61As

62As

63As

64As

65As

66As

67As

68As

69As

70As

71As

72As

73As

74As

75As

76As

77As

78As

79As

80As

81As

82As

83As

84As

85As

86As

87As

88As

89As

90As

91As

92As

истори

source

Nuclear Screening Constants

⁶⁰As

⁶¹As

⁶²As

⁶³As

⁶⁴As

⁶⁵As

⁶⁶As

⁶⁷As

⁶⁸As

⁶⁹As

⁷⁰As

⁷¹As

⁷²As

⁷³As

⁷⁴As

⁷⁵As

⁷⁶As

⁷⁷As

⁷⁸As

⁷⁹As

⁸⁰As

⁸¹As

⁸²As

⁸³As

⁸⁴As

⁸⁵As

⁸⁶As

⁸⁷As

⁸⁸As

⁸⁹As

⁹⁰As

⁹¹As

⁹²As