Arsènic (As)

chemical element with symbol As and atomic number 33

Atomic Number	33
Atomic Weight	74.921595
Rhif màs	75

Group	15
Period	4
Block	p

Proton	33 p⁺
Niwtron	42 n⁰
Electron	33 e^-

Nodwedd Ffisegol

Atomic Radius	115 pm 231 pm
molar volume	13.1 cm³/mol
covalent radius	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

Nodwedd Gemegol

egni

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

enthalpy of vaporization	32.4 kJ/mol
enthalpy of fusion
standard enthalpy of formation	302.5 kJ/mol
Electron

plisgyn yr electron	2, 8, 18, 5

valence electron	5 ⓘ

trefn yr electronnau	[Ar] 3d¹⁰ 4s² 4p³ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³

Cyflwr ocsidiad	-3, -2, -1, 0, 1, 2, 3, 4, 5
Electronegatifedd	13.08 eV/particle 0.2068208 2.18
Electrophilicity Index	1.5610969532554257 eV/particle
cyflwr sylfaenol mater

cyflwr mater	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
triple point	1,090.15 K 3,700 kPa
appearance
lliw	Silver #ff1493 #bd80e3 #bd80e3
appearance	metallic grey
Mynegrif plygiant	1.001552
nodwedd ffisegol gwrthrych
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
dargludedd trydanol	3.3 MS/m
Gwrthedd	0.0000003 Ω*m
superconductivity
magnetism
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
strwythur
Crystal Structure	Simple Trigonal (RHL)
lattice constant	4.13 Å
Lattice Angles	π/2, π/2, 2 π/3
nodwedd mecanyddol deunyddiau
hardness	1,440 MPa 3.5 MPa
bulk modulus	22 GPa
shear modulus
Young's modulus	8 GPa
Poisson's ratio
speed of sound
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
polarizability	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

Rhif màs	60
neutron number	27
Relative Atomic Mass	59.993945 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	5
nuclear quadrupole moment
dyddiad darganfod
parity	+

decay mode	intensity
p (proton emission)

⁶¹As

Rhif màs	61
neutron number	28
Relative Atomic Mass	60.981535 ± 0.000322 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	3/2
nuclear quadrupole moment
dyddiad darganfod
parity	-

decay mode	intensity
p (proton emission)

⁶²As

Rhif màs	62
neutron number	29
Relative Atomic Mass	61.973784 ± 0.000322 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	1
nuclear quadrupole moment
dyddiad darganfod
parity	+

decay mode	intensity
p (proton emission)

⁶³As

Rhif màs	63
neutron number	30
Relative Atomic Mass	62.964036 ± 0.000215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	3/2
nuclear quadrupole moment
dyddiad darganfod
parity	-

decay mode	intensity
p (proton emission)

⁶⁴As

Rhif màs	64
neutron number	31
Relative Atomic Mass	63.95756 ± 0.000218 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	69 ± 1.4 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1995
parity	+

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

⁶⁵As

Rhif màs	65
neutron number	32
Relative Atomic Mass	64.949611 ± 0.000091 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	130.3 ± 0.6 ms
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1991
parity	-

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

⁶⁶As

Rhif màs	66
neutron number	33
Relative Atomic Mass	65.944148778 ± 0.0000061 Da
g-factor	0
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	95.77 ± 0.23 ms
spin	0
nuclear quadrupole moment	0
dyddiad darganfod	1978
parity	+

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

⁶⁷As

Rhif màs	67
neutron number	34
Relative Atomic Mass	66.93925111 ± 0.000000475 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	42.5 ± 1.2 s
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1980
parity	-

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

⁶⁸As

Rhif màs	68
neutron number	35
Relative Atomic Mass	67.936774127 ± 0.000001981 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	151.6 ± 0.8 s
spin	3
nuclear quadrupole moment
dyddiad darganfod	1971
parity	+

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

⁶⁹As

Rhif màs	69
neutron number	36
Relative Atomic Mass	68.932246289 ± 0.000034352 Da
g-factor	0.6488 ± 0.0008
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	15.2 ± 0.2 m
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1955
parity	-

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

⁷⁰As

Rhif màs	70
neutron number	37
Relative Atomic Mass	69.930934642 ± 0.0000015 Da
g-factor	0.5276 ± 0.000125
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	52.6 ± 0.3 m
spin	4
nuclear quadrupole moment	0.09 ± 0.02
dyddiad darganfod	1950
parity	+

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

⁷¹As

Rhif màs	71
neutron number	38
Relative Atomic Mass	70.927113594 ± 0.000004469 Da
g-factor	0.6692 ± 0.0008
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	65.3 ± 0.07 h
spin	5/2
nuclear quadrupole moment	-0.021 ± 0.006
dyddiad darganfod	1939
parity	-

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

⁷²As

Rhif màs	72
neutron number	39
Relative Atomic Mass	71.926752291 ± 0.000004383 Da
g-factor	-1.0805 ± 0.0003
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	26 ± 0.1 h
spin	2
nuclear quadrupole moment	-0.08 ± 0.02
dyddiad darganfod	1939
parity	-

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

⁷³As

Rhif màs	73
neutron number	40
Relative Atomic Mass	72.923829086 ± 0.000004136 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	80.3 ± 0.06 d
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1948
parity	-

decay mode	intensity
ϵ (electron capture)	100%

⁷⁴As

Rhif màs	74
neutron number	41
Relative Atomic Mass	73.923928596 ± 0.000001817 Da
g-factor	-0.798 ± 0.0015
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	17.77 ± 0.02 d
spin	2
nuclear quadrupole moment
dyddiad darganfod	1938
parity	-

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

⁷⁵As

Rhif màs	75
neutron number	42
Relative Atomic Mass	74.921594562 ± 0.000000948 Da
g-factor
natural abundance	100
Dadfeilio ymbelydrol	stable isotope
Hanner oes	Not Radioactive ☢️
spin	3/2
nuclear quadrupole moment	0.311 ± 0.002
dyddiad darganfod	1920
parity	-

⁷⁶As

Rhif màs	76
neutron number	43
Relative Atomic Mass	75.922392011 ± 0.000000951 Da
g-factor	0.45115 ± 0.0005
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	1.0933 ± 0.0038 d
spin	2
nuclear quadrupole moment
dyddiad darganfod	1934
parity	-

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

⁷⁷As

Rhif màs	77
neutron number	44
Relative Atomic Mass	76.920647555 ± 0.000001816 Da
g-factor	0.86266666666667 ± 0.00086666666666667
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	38.79 ± 0.05 h
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1951
parity	-

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

⁷⁸As

Rhif màs	78
neutron number	45
Relative Atomic Mass	77.921827771 ± 0.000010498 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	90.7 ± 0.2 m
spin	2
nuclear quadrupole moment
dyddiad darganfod	1937
parity	-

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

⁷⁹As

Rhif màs	79
neutron number	46
Relative Atomic Mass	78.920948419 ± 0.000005716 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	9.01 ± 0.15 m
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1950
parity	-

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

⁸⁰As

Rhif màs	80
neutron number	47
Relative Atomic Mass	79.92247444 ± 0.000003578 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	15.2 ± 0.2 s
spin	1
nuclear quadrupole moment
dyddiad darganfod	1954
parity	+

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

⁸¹As

Rhif màs	81
neutron number	48
Relative Atomic Mass	80.922132288 ± 0.000002838 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	33.3 ± 0.8 s
spin	3/2
nuclear quadrupole moment
dyddiad darganfod	1960
parity	-

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

⁸²As

Rhif màs	82
neutron number	49
Relative Atomic Mass	81.924738731 ± 0.000004003 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	19.1 ± 0.5 s
spin	2
nuclear quadrupole moment
dyddiad darganfod	1968
parity	-

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

⁸³As

Rhif màs	83
neutron number	50
Relative Atomic Mass	82.9252069 ± 0.000003004 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	13.4 ± 0.4 s
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1968
parity	-

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

⁸⁴As

Rhif màs	84
neutron number	51
Relative Atomic Mass	83.92930329 ± 0.000003403 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	3.16 ± 0.58 s
spin	2
nuclear quadrupole moment
dyddiad darganfod	1968
parity	-

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

⁸⁵As

Rhif màs	85
neutron number	52
Relative Atomic Mass	84.932163658 ± 0.000003304 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	2.022 ± 0.007 s
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1967
parity	-

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

⁸⁶As

Rhif màs	86
neutron number	53
Relative Atomic Mass	85.936701532 ± 0.000003703 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	945 ± 8 ms
spin	1
nuclear quadrupole moment
dyddiad darganfod	1973
parity	-

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

⁸⁷As

Rhif màs	87
neutron number	54
Relative Atomic Mass	86.940291716 ± 0.000003204 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	492 ± 25 ms
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1970
parity	-

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

⁸⁸As

Rhif màs	88
neutron number	55
Relative Atomic Mass	87.94584 ± 0.000215 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes	270 ± 150 ms
spin
nuclear quadrupole moment
dyddiad darganfod	1994
parity

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

⁸⁹As

Rhif màs	89
neutron number	56
Relative Atomic Mass	88.950048 ± 0.000322 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1994
parity	-

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

⁹⁰As

Rhif màs	90
neutron number	57
Relative Atomic Mass	89.955995 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod	1997
parity

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

⁹¹As

Rhif màs	91
neutron number	58
Relative Atomic Mass	90.960816 ± 0.000429 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin	5/2
nuclear quadrupole moment
dyddiad darganfod	1997
parity	-

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

⁹²As

Rhif màs	92
neutron number	59
Relative Atomic Mass	91.967386 ± 0.000537 Da
g-factor
natural abundance
Dadfeilio ymbelydrol	☢️ elfen ymbelydrol
Hanner oes
spin
nuclear quadrupole moment
dyddiad darganfod	1997
parity

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

hanes

darganfyddwr neu ddyfeisiwr	Known to the ancients.
man darganfod
dyddiad darganfod
geirdarddiad	Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment).
ynganiad	AR-s'n-ik (Saesneg)

source

Abundance
Abundance in Earth's crust	1.8 mg/kg
natural abundance (cefnfor)	0.0037 mg/L
natural abundance (corff dynol)	0.000005 %
natural abundance (Awyrfaen)	0.00018 %
natural abundance (Haul)
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

Arsènic on ChemicalAid

Australian Educational Vocabulary ID	scot/1661
Banglapedia ID (Bengali)	আর্সেনিক
Brockhaus Enzyklopädie online ID	arsen
CAB ID	43961
CA PROP 65 ID	arsenic
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
Encyclopédie berbère article ID	2598
French Vikidia ID	Arsenic
GND	4003041-6
Great Russian Encyclopedia Online ID	2241159
Gujarati Vishwakosh entry	આર્સેનિક
ID NALT	12370
InChI	InChI=1S/As
InChIKey	RQNWIZPPADIBDY-UHFFFAOYSA-N
Krugosvet article	nauka_i_tehnika/himiya/MISHYAK.html
Krugosvet article	meditsina/myshyak-i-zdorove-cheloveka
LiverTox ID	Arsenic
NDF-RT	N0000022206
National Library of Israel J9U ID	987007294803405171
OmegaWiki Defined Meaning	255
OpenAlex ID	C502230775
OpenAlex ID	C2910930242
PACTOLS thesaurus ID	pcrt5mFxzmQ9rX
PM20 ware ID	142006
PubChem CID	5359596
Rhif Cofrestru CAS	7440-38-2
RxNorm ID	1111
Spanish Cultural Heritage thesauri ID	materias/1009757
Store medisinske leksikon ID	arsen
Store norske leksikon ID	arsen
UK Archival Thesaurus ID	f2/mt225/4347/7620
UMLS CUI	C0003818
UNII	N712M78A8G
USGS Thesaurus ID	1396
WikiSkripta ID	32671
WordNet 3.1 Synset ID	14653327-n
ZVG number	8280
dynodwr Archifau Cenedlaethol yr Unol Daleithiau	10637420
dynodwr BnF	11971740q
dynodwr Encyclopædia Universalis	arsenic-toxicologie
dynodwr Encyclopædia Universalis	arsenic
dynodwr Freebase	/m/027rq1r
dynodwr Gran Enciclopèdia Catalana	0005554
dynodwr HCIS	287
dynodwr HSDB	509
dynodwr ICSC	0013
dynodwr KBpedia	Arsenic
dynodwr KEGG	C06269
dynodwr LCAuth	sh85007449
dynodwr Llyfrgell Genedlaethol Latfia	000306779
dynodwr MeSH	D001151
dynodwr NDL	00563271
dynodwr NE.se	arsenik
dynodwr NKC	ph138910
dynodwr PSH	5803
dynodwr Quora	Arsenic-As
dynodwr Treccani	arsenico
dynodwr Wolfram Language (endid)	Entity["Mineral", "Arsenic"]
dynodwr YSO	9329
dynodwr yn thesawrws y BNCF	25597

Arsènic (As)

Nodwedd Ffisegol

Nodwedd Gemegol

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

hanes

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