IRIDIUM, Ir (77)

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ATOMIC ARCHITECTURE

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Iridium
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IRIDIUM

Ir (77)

ɪˈrɪdiəm

PHONETICS

Iridium is a very hard, brittle, silvery-white transition metal and is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.

ELEMENT BRIEF

1803 by Smithson Tennant, Antoine Fourcroy, Louis Vanquelin and Hippolyte Collet-Descotils, England.

DISCOVERY

Greek 'iris' meaning 'rainbow'.

ETYMOLOGY

Iridium

ELEMENT

Ir

SYMBOL

77

ATOMIC NUMBER

7439-88-5

CAS NUMBER
element

ELEMENTAL SPECTRUM


Silver

ELEMENTAL COLOUR


-

REFRACTIVE INDEX


0.260

POISSON RATIO


8.486 cm³

MOLAR VOLUME


1.67G Pa, 16.481'6k Atm

BRINELL HARDNESS


6.50

MOHS HARDNESS


1.76G Pa, 17.369'8k Atm

VICKERS HARDNESS


4,825 m/s, Mach 14.067'1

SPEED OF SOUND


320.00G Pa, 3.158'2M Atm

BULK MODULUS


210.00G Pa, 2.072'5M Atm

SHEAR MODULUS


528.00G Pa, 5.211'0M Atm

YOUNG MODULUS


ALLOTROPES

NONE

2,739.15 K, 2,466.00 °C

MELTING POINT


4,701.15 K, 4,428.00 °C

BOILING POINT


-

AUTOMATIC IGNITION


-

FLASHPOINT


-

CRITICAL TEMPERATURE


-

CRITICAL PRESSURE


150.000'000 W/(m K)

THERMAL CONDUCTIVITY


0.000'006'4 K¯¹

THERMAL EXPANSION


131.00 J/(kg K)

SPECIFIC HEAT


26.000 kJ/mol

HEAT FUSION


560.000 kJ/mol

HEAT VAPORISATION


-

HEAT COMBUSTION


-

CURIE POINT


-

NEEL POINT


-

ADIABATIC INDEX


Solid

PHASE

Conductor

ELECTRICAL TYPE


21.00M S/m

CONDUCTIVITY


47.00n Ω.m

RESISTIVITY


0.110 K

SUPERCONDUCTING POINT


Paramagnetic

MAGNETIC TYPE


0.000'000'002'3

MASS SUSCEPTIBILITY


0.000'000'000'442'00

MOLAR SUSCEPTIBILITY


0.000'052'100'00

VOLUME SUSCEPTIBILITY

Transition Metal

CLASSIFICATION


192.216'056'5

ATOMIC WEIGHT


177 pm

ATOMIC RADIUS


122 pm

COVALENT RADIUS SINGLE BOND


115 pm

COVALENT RADIUS DOUBLE BOND


107 pm

COVALENT RADIUS TRIPLE BOND


202 pm

VAN DER WAALS RADIUS


[Xe]6s²4f¹⁴5d⁷

ELECTRON CONFIGURATION


Cubic, Face-centred

CRYSTAL STRUCTURE


22.650'00 g/cm³

DENSITY AS SOLID


19.000'00 g/cm³

DENSITY AS LIQUID


-

DENSITY AS GAS


Fm_3m

SPACE GROUP NAME


225

SPACE GROUP NUMBER


π/2, π/2 π/2

LATTICE ANGLES


383.9, 383.9 383.9 pm

LATTICE CONSTANTS

6

VALENCE


2.2

ELECTRONEGATIVITY


150.91 kJ/mol

ELECTRON AFFINITY


IONISATION ENERGY

element element

0.000'000'2 %

UNIVERSE


0.000'054 %

METEORITES


0.000'000'3 %

SUN


0.000'000'04 %

EARTH CRUST


-

OCEANS


-

HUMANS

Stable

HALF LIFE


Stable

LIFETIME


5s⁷ = 5, 2, -1, -1/2

QUANTUM NUMBERS


14.000'00 b σs

NEUTRON CROSS SECTION


425.000'00 b σa

NEUTRON MASS ABSORPTION


STABLE ISOTOPES

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UNSTABLE ISOTOPES

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ISOTOPIC CHAIN

CENTRALDATACORE

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