Iridium Properties

Iridium

Physical

Melting Point

2,410.00 °C 7

Boiling Point

4,527.00 °C 10

Hardness

Mohs Hardness

6.50 5

Brinell Hardness

1,670.00 MPa 5

Vickers Hardness

1,760.00 MPa 3

Optical Properties

Refractive Index

Not Available 0

Reflectivity

78.00 % 6

Speed of Sound

4,825.00 m/s 13

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Ir 0

Isotopes

Known Isotopes

34 5

Electronegativity

Pauling Electronegativity

2.20 4

Sanderson Electronegativity

Not Available 0

Allred Rochow Electronegativity

1.55 11

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.68 17

Electropositivity

Pauling Electropositivity

1.80 49

Ionization Energies

1st Energy Level

880.00 kJ/mol 9

2nd Energy Level

1,600.00 kJ/mol 35

3rd Energy Level

Not Available 0

Electrochemical Equivalent

1.14 g/amp-hr 54

Electron Work Function

4.55 eV 13

Other Chemical Properties

Flammable, Ionization, Radioactive Isotopes, Radioactivity 0

Mechanical

Density

Density At Room Temperature

22.56 g/cm³ 10

Density When Liquid (at m.p.)

19.00 g/cm3 3

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.00 (Pa) 25

Tensile Strength

2,000.00 MPa 2

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

210.00 GPa 2

Bulk Modulus

320.00 GPa 3

Young's Modulus

528.00 GPa 1

Poisson Ratio

0.26 22

Other Mechanical Properties

NA 0

Periodic Table

Symbol

Ir 0

Group Number

9 9

Period Number

6 2

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

77 39

Atomic Weight

192.22 amu 34

Atomic Volume

9.53 cm3/mol 50

Electron Configuration

[Xe] 4f¹⁴ 5d⁷ 6s² 0

Valence Electron Potential

140.00 (-eV) 5

Atom

Number of Protons

74 41

Number of Neutrons

110 27

Number of Electrons

74 41

Crystal Structure

Face Centered Cubic (FCC) 0

Crystal Lattice

FCC-Crystal-Structure-of-Iridium.jpg#100 0

Radius of an Atom

Atomic Radius

136.00 pm 41

Covalent Radius

141.00 pm 43

Van der Waals Radius

202.00 pm 27

Lattice Constant

383.90 pm 26

Lattice Angles

π/2, π/2, π/2 0

Lattice C/A Ratio

Not Available 0

Adjacent Atomic Numbers

Next Element

20 0

Previous Element

44 0

Magnetic

Electrical Properties

Resistivity

47.10 nΩ·m 44

Electrical Conductivity

0.19 10⁶/cm Ω 10

Electron Affinity

151.00 kJ/mol 4

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

21.78 3

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.13 J/(kg K) 39

Thermal Conductivity

147.00 W/m·K 10

Critical Temperature

Not Available 0

Molar Heat Capacity

25.10 J/mol·K 43

Thermal Expansion

6.40 µm/(m·K) 51

Standard Molar Entropy

35.50 J/mol.K 43

Enthalpy

Enthalpy of Vaporization

799.10 kJ/mol 1

Enthalpy of Fusion

35.23 kJ/mol 1

Enthalpy of Atomization

837.00 kJ/mol 1

All >>

<< Thermal

Transition Metals

Compare Transition Metals

Transition Metals

Tantalum
Periodi... | Physical | Chemical | Mechanical

Technetium
Periodi... | Physical | Chemical | Mechanical

Yttrium
Periodi... | Physical | Chemical | Mechanical

» More Transition Metals

Compare Transition Metals

Rhodium vs Molybdenum
Periodi... | Physical | Chemical | Mechanical

Cadmium vs Molybdenum
Periodi... | Physical | Chemical | Mechanical

Vanadium vs Molybdenum
Periodi... | Physical | Chemical | Mechanical

» More Compare Transition Metals

Transition Metals + -

Actinide Metals + -

Lanthanide Metals + -

Post-Transition Metals + -

Alkaline Earth Metals + -

Iridium Properties

Transition Metals

Compare Transition Metals

Transition Metals

Compare Transition Metals