KRYPTON, Kr (36)

Krypton is a colourless, odourless, tasteless noble gas. Krypton occurs in trace amounts in the atmosphere and is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.

ELEMENT BRIEF

1898 by Sir William Ramsay and Morris W. Travers, Great Britain.

DISCOVERY

Ancient Greek, κρυπτός (kruptós, 'hidden').

ETYMOLOGY

Krypton

ELEMENT

Kr

SYMBOL

36

ATOMIC NUMBER

7439-90-9

CAS NUMBER

ELEMENTAL SPECTRUM

Colourless

ELEMENTAL COLOUR

1.000'427

REFRACTIVE INDEX

-

POISSON RATIO

22.346 cm³

MOLAR VOLUME

-

BRINELL HARDNESS

-

MOHS HARDNESS

-

VICKERS HARDNESS

1,120 m/s, Mach 3.265'3

SPEED OF SOUND

1.90G Pa, 18.751'5k Atm

BULK MODULUS

-

SHEAR MODULUS

-

YOUNG MODULUS

ALLOTROPES

NONE

115.79 K, -157.36 °C

MELTING POINT

119.93 K, -153.22 °C

BOILING POINT

-

AUTOMATIC IGNITION

-

FLASHPOINT

209.41 K, -63.74 °C

CRITICAL TEMPERATURE

0.009'430 W/(m K)

CRITICAL PRESSURE

-

THERMAL CONDUCTIVITY

-

THERMAL EXPANSION

248.05 J/(kg K)

SPECIFIC HEAT

1.640 kJ/mol

HEAT FUSION

9.020 kJ/mol

HEAT VAPORISATION

-

HEAT COMBUSTION

-

CURIE POINT

-

NEEL POINT

5/3

ADIABATIC INDEX

Gas

PHASE

-

ELECTRICAL TYPE

-

CONDUCTIVITY

-

RESISTIVITY

-

SUPERCONDUCTING POINT

Diamagnetic

MAGNETIC TYPE

-0.000'000'004'4

MASS SUSCEPTIBILITY

-0.000'000'000'369'00

MOLAR SUSCEPTIBILITY

-0.000'000'016'50

VOLUME SUSCEPTIBILITY

Noble Gas

CLASSIFICATION

83.799'324'8

ATOMIC WEIGHT

88 pm

ATOMIC RADIUS

117 pm

COVALENT RADIUS SINGLE BOND

121 pm

COVALENT RADIUS DOUBLE BOND

108

COVALENT RADIUS TRIPLE BOND

202 pm

VAN DER WAALS RADIUS

[Ar]4s²3d¹⁰4p⁶

ELECTRON CONFIGURATION

Cubic, Face-centred

CRYSTAL STRUCTURE

-

DENSITY AS SOLID

-

DENSITY AS LIQUID

3.750'00 g/cm³

DENSITY AS GAS

Fm_3m

SPACE GROUP NAME

225

SPACE GROUP NUMBER

π/2, π/2 π/2

LATTICE ANGLES

570.6, 570.6 570.6 pm

LATTICE CONSTANTS

2

VALENCE

3

ELECTRONEGATIVITY

-96.49 kJ/mol

ELECTRON AFFINITY

IONISATION ENERGY