OXYGEN, O (8)

Oxygen in its molecular form, O2, is odourless, colourless as a gas yet pale blue as a liquid and is a highly reactive non-metallic element and oxidizing agent. Photosynthesis releases oxygen, and respiration consumes oxygen.

ELEMENT BRIEF

1772 by Carl Wilhelm Scheele, Sweden.

DISCOVERY

French, oxygène in the form principe oxygène.

ETYMOLOGY

Oxygen

ELEMENT

O

SYMBOL

8

ATOMIC NUMBER

7782-44-7

CAS NUMBER

ELEMENTAL SPECTRUM

Colourless

ELEMENTAL COLOUR

1.000'271

REFRACTIVE INDEX

-

POISSON RATIO

11.196 cm³

MOLAR VOLUME

-

BRINELL HARDNESS

-

MOHS HARDNESS

-

VICKERS HARDNESS

318 m/s, Mach 0.927'1

SPEED OF SOUND

-

BULK MODULUS

-

SHEAR MODULUS

-

YOUNG MODULUS

ALLOTROPES

54.85 K, -218.30 °C

MELTING POINT

90.25 K, -182.90 °C

BOILING POINT

-

AUTOMATIC IGNITION

-

FLASHPOINT

154.59 K, -118.56 °C

CRITICAL TEMPERATURE

5.04M Pa, 50 Atm

CRITICAL PRESSURE

0.026'580 W/(m K)

THERMAL CONDUCTIVITY

-

THERMAL EXPANSION

919.00 J/(kg K)

SPECIFIC HEAT

0.222 kJ/mol

HEAT FUSION

3.410 kJ/mol

HEAT VAPORISATION

-

HEAT COMBUSTION

-

CURIE POINT

-

NEEL POINT

7/5

ADIABATIC INDEX

Gas

PHASE

-

ELECTRICAL TYPE

-

CONDUCTIVITY

-

RESISTIVITY

-

SUPERCONDUCTING POINT

Paramagnetic

MAGNETIC TYPE

0.000'001'335'0

MASS SUSCEPTIBILITY

0.000'000'021'359'20

MOLAR SUSCEPTIBILITY

0.000'001'907'72

VOLUME SUSCEPTIBILITY

Non Metal

CLASSIFICATION

15.999'404'9

ATOMIC WEIGHT

48 pm

ATOMIC RADIUS

63 pm

COVALENT RADIUS SINGLE BOND

57 pm

COVALENT RADIUS DOUBLE BOND

53 pm

COVALENT RADIUS TRIPLE BOND

152 pm

VAN DER WAALS RADIUS

[He]2s²2p⁴

ELECTRON CONFIGURATION

Cubic, Primitive

CRYSTAL STRUCTURE

-

DENSITY AS SOLID

-

DENSITY AS LIQUID

1.429'00 g/cm³

DENSITY AS GAS

C12/m1

SPACE GROUP NAME

12

SPACE GROUP NUMBER

π/2, 2.313’085 π/2

LATTICE ANGLES

540.3, 342.9 508.6 pm

LATTICE CONSTANTS

2

VALENCE

3.44

ELECTRONEGATIVITY

140.98 kJ/mol

ELECTRON AFFINITY

IONISATION ENERGY