Arsenic

Overview

English Name:

Arsenic

Latin Name:

Arsenicum

Year Discovered:

1250

Discovered By:

Albertus Magnus

Group:

15

Period:

4

Electrons:

33

CAS Number:

7440-38-2

Cost Per 100 Grams:

$20

Atomic Properties

Electronic Configuration:

[Ar] 3d¹⁰ 4s² 4p³

Ion Charge:

+3, +5

Ionisation Energies:

947.0 kJ/mol

Atomic Radius (Empirical):

115 pm

Atomic Radius (Calculated):

114 pm

Covalent Radius:

120 pm

Van Der Waals Radius:

202 pm

Ionisation Potential of An Atom:

9.79 eV

Electrons Per Layer:

2, 8, 18, 5

Atomic Multiplicities Of The Gas:

1

Atomic Weight:

74.92

Reactivity

Electron Affinity:

78 kJ/mol

Valence:

3, 5

Electronegativity:

2.18

Thermal Properties

Melting Point:

817°C

Boiling Point:

613°C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

0.5 W/(m·K)

Heat Capacity:

Specific: 0.32 J/(g·K)

Molar: 24.64 J/(mol·K)

Thermal Coefficient:

0.00001

Enthalpy:

Fusion: 12.6 kJ/mol

Vaporisation: 323.0 kJ/mol

Atomization: 280.0 kJ/mol

Curie Temperature:

N/A

Neel Temperature:

N/A

Superconductivity Point:

N/A

Physical and Chemical Properties

State of matter (25° C/ 77°F):

Solid

Density:

Solid: 5.73 g/cm³

Molar Volume (Vmol):

13.1 cm³/mol

Speed of Sound (Vs):

3000 m/s

Hardness:

3.5 (Mohs)

Bulk Modulus (K):

29 GPa

Shear Modulus (G):

25 GPa

Young's Modulus (E):

80 GPa

Color:

Gray

Brinell Hardness (MPa):

800 MPa

Liquid Density (Kg/m^3):

6.0 kg/m³

Hardness of Mohs:

3.5

Refractive Index:

N/A

Vickers Hardness (MPa):

600 MPa

Crystal Structure:

Rhombic

Electromagnetic Properties

Electrical Type:

Semiconductor

Resistivity:

10^7 Ω·m

Magnetic Type:

Diamagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

-1.0 × 10^-5

Mass Magnetic Susceptibility:

-1.5 × 10^-5 m³/kg

Molar Mass Susceptibility:

-3.0 × 10^-5 m³/mol

Electrical Conductivity:

10^-6 S/m

Mass (γ_mass):

5.0 × 10^-26 kg

Mass (γ_mol):

5.0 × 10^-23 mol

Volume (γ_vol):

13.1 L

Grid Parameters

Crystal Structure:

Rhombic

Grid Parameters:

N/A

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Danger

Hazard Statements:

H300, H350

Precautionary Statements:

P201, P202, P261

RTECS Number:

Not available

Risk:

Flammability: Non-flammable
Health Risk: Toxic
Reactivity: Stable
Specific Risk: None

Importance

Main sources:

Minerals, recycling

Main Usage:

Alloys, semiconductors, pesticides

Nuclear Properties

Radioactive:

No

Isotopes:

As-75

Neutron Cross Sectional:

0.1 barns

Half Life (s):

None

Lifetime:

Stable

Prevalence

Universe:

0.00003%

Sun:

0.00003%

Oceans:

0.000001%

Humans:

0.00001%

Earth's Crust:

0.0005%

Meteorites:

0.0001%