ARSENIC, As (33)

Arsenic is within many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid and it can exist in various allotropes, although only the grey form has importance to industry.

ELEMENT BRIEF

Circa 2,500 BCE.

DISCOVERY

Greek, 'arsenikon' meaning 'yellow orpiment'.

ETYMOLOGY

Arsenic

ELEMENT

As

SYMBOL

33

ATOMIC NUMBER

7440-38-2

CAS NUMBER

ELEMENTAL SPECTRUM

Silver

ELEMENTAL COLOUR

1.001'552

REFRACTIVE INDEX

-

POISSON RATIO

13.082 cm³

MOLAR VOLUME

1.44G Pa, 14.211'7k Atm

BRINELL HARDNESS

3.50

MOHS HARDNESS

-

VICKERS HARDNESS

-

SPEED OF SOUND

22.00G Pa, 217.123'1k Atm

BULK MODULUS

8.00G Pa, 78.953'9k Atm

SHEAR MODULUS

-

YOUNG MODULUS

ALLOTROPES

1,090.15 K, 817.00 °C

MELTING POINT

887.15 K, 614.00 °C

BOILING POINT

-

AUTOMATIC IGNITION

-

FLASHPOINT

-

CRITICAL TEMPERATURE

-

CRITICAL PRESSURE

50.000'000 W/(m K)

THERMAL CONDUCTIVITY

-

THERMAL EXPANSION

328.00 J/(kg K)

SPECIFIC HEAT

27.700 kJ/mol

HEAT FUSION

32.400 kJ/mol

HEAT VAPORISATION

536.000 J/(kg K)

HEAT COMBUSTION

-

CURIE POINT

-

NEEL POINT

-

ADIABATIC INDEX

Solid

PHASE

Conductor

ELECTRICAL TYPE

3.30M S/m

CONDUCTIVITY

300.00n Ω.m

RESISTIVITY

-

SUPERCONDUCTING POINT

Diamagnetic

MAGNETIC TYPE

-0.000'000'003'9

MASS SUSCEPTIBILITY

-0.000'000'000'292'00

MOLAR SUSCEPTIBILITY

-0.000'022'300'00

VOLUME SUSCEPTIBILITY

Metalloid

CLASSIFICATION

74.921'596'5

ATOMIC WEIGHT

114 pm

ATOMIC RADIUS

121 pm

COVALENT RADIUS SINGLE BOND

114 pm

COVALENT RADIUS DOUBLE BOND

106

COVALENT RADIUS TRIPLE BOND

185 pm

VAN DER WAALS RADIUS

[Ar]4s²3d¹⁰4p³

ELECTRON CONFIGURATION

Rhombohedral, Primitive

CRYSTAL STRUCTURE

5.727'00 g/cm³

DENSITY AS SOLID

5.220'00 g/cm³

DENSITY AS LIQUID

-

DENSITY AS GAS

R_3m

SPACE GROUP NAME

166

SPACE GROUP NUMBER

π/2, π/2 2π/3

LATTICE ANGLES

375.98, 375.98 1054.75 pm

LATTICE CONSTANTS

5

VALENCE

2.18

ELECTRONEGATIVITY

78.54 kJ/mol

ELECTRON AFFINITY

IONISATION ENERGY