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Arsenic Quick Reference

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Notes

Symbol

As

Atomic Number

33

Atomic Weight

Rounded

74.92

for regular calculations

Standard

74.92160 ± 0.00002

for precise calculations

Oxidation States

 5

more common with disagreement

 3

more common with disagreement

 2

less common

-3

less common with disagreement

Pauling Electronegativity

oxidation state: 3

2.18

Electron Configuration

Orbital Occupancy

[Ar] 3d10 4s2 4p3

[Ar] represents the closed-shell electron configuration of argon

Orbital Filling Order

[Ar] 4s2 3d10 4p3

[Ar] represents the closed-shell electron configuration of argon

Term Symbol

4S3/2

see expanded configuration ...

Ionization Energies

I   (1)

 9.7886 eV

II  (2)

18.5892 eV

III (3)

28.351 eV 

IV  (4)

50.13 eV  

see all 6 energies ...

Electron Affinity

0.814 ± 0.008 eV

 6570 ± 70 cm-1 

Density

liquid, 1090.15 K

5.286 g/ml 

solid, 25 °C

5.778 g/cm3

Molar Volume

solid, 298 K, 1 atm

12.95 cm3/mol

Melting Point

gray arsenic, 38.6 atm

816 °C

Boiling Point

gray arsenic, 1 atm

616 °C

sublimes

Thermal Conductivity

gray arsenic, solid

400 K, polycrystalline

40.6 W/(m K)

extrapolated or estimated

300 K, polycrystalline

50.0 W/(m K)

extrapolated or estimated

298.2 K, polycrystalline

50.2 W/(m K)

extrapolated or estimated

273.2 K, polycrystalline

53.9 W/(m K)

extrapolated or estimated

200 K, polycrystalline

69.0 W/(m K)

extrapolated or estimated

see all 13 conductivities ...

Pyykkö Covalent Radius

single bond

121 pm

double bond

114 pm

triple bond

106 pm

Atomic Radius

120 pm

Quantity

Arsenic Atomic Structure

Notes

Ionization Energies

I   (1)

 9.7886 eV

II  (2)

18.5892 eV

III (3)

28.351 eV 

IV  (4)

50.13 eV  

see all 6 energies ...

Electron Affinity

0.814 ± 0.008 eV

 6570 ± 70 cm-1 

Electron Binding Energies

K    (1s)

11867 eV  

LI   (2s)

 1527.0 eV

LII  (2p1/2)

 1359.1 eV

LIII (2p3/2)

 1323.6 eV

see all 9 energies ...

Electron Configuration

Orbital Occupancy

[Ar] 3d10 4s2 4p3

[Ar] represents the closed-shell electron configuration of argon

Orbital Filling Order

[Ar] 4s2 3d10 4p3

[Ar] represents the closed-shell electron configuration of argon

Term Symbol

4S3/2

see expanded configuration ...

Clementi-Raimondi Effective Nuclear Charge

1s

Orbital Exponent

32.2783

ζ

Principle Quantum Number

1

n

Effective Nuclear Charge

32.2783

Zeff = ζ × n

2s

Orbital Exponent

12.0635

ζ

Principle Quantum Number

2

n

Effective Nuclear Charge

24.1270

Zeff = ζ × n

see all 8 effective nuclear charges ...

Screening Percentage

70.3%

Fluorescence Yields

ωK

0.575 

ωL1

0.0028

ωL2

0.014 

ωL3

0.016 

Coster-Kronig Yields

F12

0.28 

F13

0.53 

F23

0.063

Quantity

Arsenic Physical Properties

Notes

Density

liquid, 1090.15 K

5.286 g/ml 

solid, 25 °C

5.778 g/cm3

Molar Mass

Rounded

74.92 g/mol

for regular calculations

Standard

74.92160 ± 0.00002 g/mol

for precise calculations

Molar Volume

solid, 298 K, 1 atm

12.95 cm3/mol

Physical Form

gray arsenic

gray metal

yellow arsenic

soft yellow cubic crystals

Specific Gravity

68 °F, water at 4 °C (39.2 °F)

5.73

Young's Modulus

gray arsenic

22 GPa

Electrical Resistivity

solid, 273 K

26×10-8 Ohm m

Photoelectric Work Function

5.11 eV

Superconducting Transition Temperature

32 GPa

2.4 K

maximum temperature

Mineralogical Hardness

3.5

Isothermal Bulk Modulus

300 K

39.4 GPa

Isothermal Compressibility

300 K

0.0254 GPa-1

Gram Atomic Volume

16 cm3

Quantity

Arsenic Atomic Interaction

Notes

Oxidation States

 5

more common with disagreement

 3

more common with disagreement

 2

less common

-3

less common with disagreement

Pauling Electronegativity

oxidation state: 3

2.18

Mulliken-Jaffe Electronegativity

oxidation state: 3

hybridsp3

2.38

hybrid20% s

2.26

orbitalp

1.78

Sanderson Electronegativity

oxidation state: 3

2.82

Allred-Rochow Electronegativity

oxidation state: 3

2.20

Configuration Energy

electron volt units

13.08 eV

Pauling units

 2.211  

Allen Electronegativity

oxidation state: 3

2.211

Allred Electronegativity

oxidation state: 3

2.18

Boyd-Edgecombe Electronegativity

2.21

Ghosh-Gupta Electronegativity

5.5372 eV

Nagle Electronegativity

2.11

Pearson Absolute Electronegativity

5.3 eV

Smith Electronegativity

oxidation state: 3

2.0

Chemical Hardness

4.5 eV

Cohesive Energy

per mole

285.3 kJ/mol  

per atom

  2.96 eV/atom

Quantity

Arsenic Thermodynamics

Notes

Melting Point

gray arsenic, 38.6 atm

816 °C

Boiling Point

gray arsenic, 1 atm

616 °C

sublimes

Thermal Conductivity

gray arsenic, solid

400 K, polycrystalline

40.6 W/(m K)

extrapolated or estimated

300 K, polycrystalline

50.0 W/(m K)

extrapolated or estimated

298.2 K, polycrystalline

50.2 W/(m K)

extrapolated or estimated

273.2 K, polycrystalline

53.9 W/(m K)

extrapolated or estimated

200 K, polycrystalline

69.0 W/(m K)

extrapolated or estimated

see all 13 conductivities ...

Triple Point

temperature

817 °C

pressure

37 atm

Critical Point

2100 K

Vapor Pressure

601 °C

100 kPa

508 °C

10 kPa

433 °C

1 kPa

see all 16 pressures ...

Isobaric Molar Heat Capacity

298.15 K, 1 bar

24.64 J/(mol K)

gray arsenic, 298.15 K, 1 bar

24.64 J/(mol K)

Isobaric Specific Heat Capacity

298.15 K, 1 bar

0.329 J/(g K)

Electronic Heat Capacity Coefficient

0.191 mJ/(mol K2)

Debye Temperature

Low Temperature Limit ( 0 K )

282 K

Room Temperature ( 298 K )

275 K

Quantity

Arsenic Identification

Notes

CAS Number

gray arsenic

7440-38-2

yellow arsenic

7440-38-2

DOT Number

1558

dust

1562

ICSC Number

gray arsenic

0013

RTECS Number

CG0525000

UN Number

gray arsenic

1558

Quantity

Arsenic Atomic Size

Notes

Atomic Radius

120 pm

Orbital Radius

100.1 pm

Pyykkö Covalent Radius

single bond

121 pm

double bond

114 pm

triple bond

106 pm

Cordero Covalent Radius

119 pm

Shannon-Prewitt Crystal Radius

ion charge: +3, coordination number: 6

72 pm  

ion charge: +5

coordination number: 4

47.5 pm

coordination number: 6

60 pm  

Shannon-Prewitt Effective Ionic Radius

ion charge: +3, coordination number: 6

58 pm  

ion charge: +5

coordination number: 4

33.5 pm

coordination number: 6

46 pm  

Pauling Empirical Crystal Radius

ion charge: +5

 47 pm

ion charge: -3

222 pm

Pauling Univalent Radius

ion charge: +1

 71 pm

ion charge: -1

285 pm

Batsanov Crystallographic Van Der Waals Radius

205 pm

Batsanov Equilibrium Van Der Waals Radius

225 pm

Bondi Van Der Waals Radius

185 pm

Pauling Van Der Waals Radius

2.0×102 pm

Slater Atomic-Ionic Radius

115 pm

Quantity

Arsenic Crystal Structure

Notes

Allotropes

allotrope

gray arsenic

alternate name

grey arsenic

alternate name

metallic arsenic

alternate name

ordinary arsenic

alternate name

rhombohedral arsenic

alternate name

α-arsenic

symbol

αAs

allotrope

β-amorphous arsenic

allotrope

γ-amorphous arsenic

allotrope

δ-amorphous arsenic

allotrope

orthorhombic arsenic

alternate name

arsenolamprite arsenic

alternate name

ε-arsenic

symbol

εAs

allotrope

yellow arsenic

alternate name

cubic arsenic

allotrope

fcc arsenic

Nearest Neighbor Distance

300 K, 1 atm

316 pm

Atomic Concentration

300 K, 1 atm

4.65×1022 cm-3

Quantity

Arsenic History

Notes

Discovery

date of discovery

circa 1250

discoverer

Albertus Magnus

birth

1193

death

1280

location of discovery

Germany

Origin of Element Name

origin

arsenikon

origin description

mineral—Greek for yellow orpiment

Origin of Element Symbol

symbol: As

origin

arsenic

origin description

element name

U.S. Towns Named After Elements

Arsenic Tubs, Arizona

Quantity

Arsenic Abundances

Notes

Earth's Crust

1.8 ppm

Earth's Mantle

0.066 ppm

primitive mantle

Earth's Core

5 ppm

Bulk Earth

1.7 ppm

Ocean Water

0.0023 ppm

Metalliferous Ocean Sediment

Ridge

145 ppm

River Water

≈0.001 ppm

U.S. Coal

24 ppm

Human Body

7 mg

based on a 70 kg "reference man"

Human Bone

0.08 ppm to 1.6 ppm

Human Hair

0.06 ppm to 3.7 ppm

Human Kidney

0.007 ppm to 1.5 ppm

Human Liver

0.023 ppm to 1.6 ppm

Human Muscle

0.009 ppm to 0.65 ppm

Human Nail

0.2 ppm to 3 ppm

Bacteria

0.1 ppm

Ferns

1.3 ppm

Fungi

1.2 ppm to 2.5 ppm

Solar System

6.56

number of atoms for every 106 atoms of silicon

Meteorites

2.35 ± 0.02

base 10 log of the number of atoms for every 1012 atoms of hydrogen

Quantity

Arsenic Nomenclature

Notes

Element Names in Other Languages

French

arsenic

German

Arsen

Italian

arsenico

Spanish

arsénico

Portuguese

arsénic

Anions or Anionic Substituent Groups

arsenide (general)

As3-, arsenide(3-), arsanetriide

Cations or Cationic Substituent Groups

arsenic

Ligands

arsenido (general)

As3-, arsanetriido

Heteroatomic Anion

arsenate

'a' Term—Substitutive Nomenclature

arsa

'y' Term—Chains and Rings Nomenclature

arsy

References    (Click the button next to a value above to see complete citation information for that entry)

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