Periodic Table Element Comparison: Compare Elements - Osmium vs Iridium
Compare Osmium and Iridium on the basis of their properties, attributes and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we study periodic table elements. You can study the detailed comparison between Osmium vs Iridium with most reliable information about their properties, attributes, facts, uses etc. You can compare Os vs Ir on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Osmium and Iridium comparison table on more than 90 properties.
Osmium and Iridium Comparison
Facts
| Name | Osmium | Iridium |
|---|---|---|
| Atomic Number | 76 | 77 |
| Atomic Symbol | Os | Ir |
| Atomic Weight | 190.23 | 192.217 |
| Phase at STP | Solid | Solid |
| Color | SlateGray | Silver |
| Metallic Classification | Transition Metal | Transition Metal |
| Group in Periodic Table | group 8 | group 9 |
| Group Name | iron family | cobalt family |
| Period in Periodic Table | period 6 | period 6 |
| Block in Periodic Table | d -block | d -block |
| Electronic Configuration | [Xe] 4f14 5d6 6s2 | [Xe] 4f14 5d7 6s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 14, 2 | 2, 8, 18, 32, 15, 2 |
| Melting Point | 3306 K | 2739 K |
| Boiling Point | 5285 K | 4701 K |
| CAS Number | CAS7440-04-2 | CAS7439-88-5 |
| Neighborhood Elements | Neighborhood Elements of Osmium | Neighborhood Elements of Iridium |
History
| Parameter | Osmium | Iridium |
|---|---|---|
| History | The element Osmium was discovered by S. Tennant in year 1803 in United Kingdom. Osmium derived its name from the Greek osmè, meaning 'smell'. | The element Iridium was discovered by S. Tennant in year 1803 in France and United Kingdom. Iridium derived its name from Iris, the Greek goddess of the rainbow. |
| Discovery | S. Tennant (1803) | S. Tennant (1803) |
| Isolated | S. Tennant (1803) | S. Tennant (1803) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Osmium | Iridium |
|---|---|---|
| Abundance in Universe | 3 / 0.02 | 2 / 0.01 |
| Abundance in Sun | 2 / 0.02 | 2 / 0.01 |
| Abundance in Meteorites | 670 / 70 | 550 / 60 |
| Abundance in Earth's Crust | 1.8 / 0.2 | 0.4 / 0.05 |
| Abundance in Oceans | - / - | - / - |
| Abundance in Humans | - / - | - / - |
Crystal Structure and Atomic Structure
| Property | Osmium | Iridium |
|---|---|---|
| Atomic Volume | 8.421 cm3/mol | 8.5203 cm3/mol |
| Atomic Radius | 185 pm | 180 pm |
| Covalent Radius | 128 pm | 137 pm |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 273.44, 273.44, 431.73 pm | 383.9, 383.9, 383.9 pm |
| Lattice Angle | π/2, π/2, 2 π/3 | π/2, π/2, π/2 |
| Space Group Name | P63/mmc | Fm_ 3m |
| Space Group Number | 194 | 225 |
| Crystal Structure | Simple Hexagonal  | Face Centered Cubic  |
Atomic and Orbital Properties
| Property | Osmium | Iridium |
|---|---|---|
| Atomic Number | 76 | 77 |
| Number of Electrons (with no charge) | 76 | 77 |
| Number of Protons | 76 | 77 |
| Mass Number | 190.23 | 192.217 |
| Number of Neutrons | 114 | 115 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 14, 2 | 2, 8, 18, 32, 15, 2 |
| Electron Configuration | [Xe] 4f14 5d6 6s2 | [Xe] 4f14 5d7 6s2 |
| Valence Electrons | 5d6 6s2 | 5d7 6s2 |
| Oxidation State | 4 | 3, 4 |
| Atomic Term Symbol (Quantum Numbers) | 5D4 | 4F9/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Osmium has 6 stable naturally occuring isotopes while Iridium has 2 stable naturally occuring isotopes.
| Parameter | Osmium | Iridium |
|---|---|---|
| Known Isotopes | 162Os, 163Os, 164Os, 165Os, 166Os, 167Os, 168Os, 169Os, 170Os, 171Os, 172Os, 173Os, 174Os, 175Os, 176Os, 177Os, 178Os, 179Os, 180Os, 181Os, 182Os, 183Os, 184Os, 185Os, 186Os, 187Os, 188Os, 189Os, 190Os, 191Os, 192Os, 193Os, 194Os, 195Os, 196Os | 164Ir, 165Ir, 166Ir, 167Ir, 168Ir, 169Ir, 170Ir, 171Ir, 172Ir, 173Ir, 174Ir, 175Ir, 176Ir, 177Ir, 178Ir, 179Ir, 180Ir, 181Ir, 182Ir, 183Ir, 184Ir, 185Ir, 186Ir, 187Ir, 188Ir, 189Ir, 190Ir, 191Ir, 192Ir, 193Ir, 194Ir, 195Ir, 196Ir, 197Ir, 198Ir, 199Ir |
| Stable Isotopes | Naturally occurring stable isotopes: 184Os, 187Os, 188Os, 189Os, 190Os, 192Os | Naturally occurring stable isotopes: 191Ir, 193Ir |
| Neutron Cross Section | 15 | 425 |
| Neutron Mass Absorption | 0.0023 | 0.08 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Osmium | Iridium |
|---|---|---|
| Valence or Valency | 6 | 6 |
| Electronegativity | 2.2 Pauling Scale | 2.2 Pauling Scale |
| Electron Affinity | 106.1 kJ/mol | 151 kJ/mol |
| Ionization Energies | 1st: 840 kJ/mol 2nd: 1600 kJ/mol | 1st: 880 kJ/mol 2nd: 1600 kJ/mol |
Physical Properties
| Property | Osmium | Iridium |
|---|---|---|
| Density | 22.59 g/cm3 | 22.56 g/cm3 |
| Molar Volume | 8.421 cm3/mol | 8.5203 cm3/mol |
Elastic Properties | ||
| Young Modulus | - | 528 |
| Shear Modulus | 222 GPa | 210 GPa |
| Bulk Modulus | - | 320 GPa |
| Poisson Ratio | 0.25 | 0.26 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 7 MPa | 6.5 MPa |
| Vickers Hardness | - | 1760 MPa |
| Brinell Hardness | 3920 MPa | 1670 MPa |
Electrical Properties | ||
| Electrical Conductivity | 12000000 S/m | 21000000 S/m |
| Resistivity | 8.1e-8 m Ω | 4.7e-8 m Ω |
| Superconducting Point | 0.66 | 0.11 |
Heat and Conduction Properties | ||
| Thermal Conductivity | 88 W/(m K) | 150 W/(m K) |
| Thermal Expansion | 0.0000051 /K | 0.0000064 /K |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 6e-10 m3/kg | 1.67e-9 m3/kg |
| Molar Magnetic Susceptibility | 1.1e-10 m3/mol | 3.21e-10 m3/mol |
| Volume Magnetic Susceptibility | 0.000014 | 0.0000377 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 4940 m/s | 4825 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Osmium | Iridium |
|---|---|---|
| Melting Point | 3306 K | 2739 K |
| Boiling Point | 5285 K | 4701 K |
| Critical Temperature | - | - |
| Superconducting Point | 0.66 | 0.11 |
Enthalpies | ||
| Heat of Fusion | 31 kJ/mol | 26 kJ/mol |
| Heat of Vaporization | 630 kJ/mol | 560 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Osmium | Iridium |
|---|---|---|
| CAS Number | CAS7440-04-2 | CAS7439-88-5 |
| RTECS Number | RTECSRN1100000 | - |
| DOT Hazard Class | 4.1 | 4.1 |
| DOT Numbers | 3089 | 3089 |
| EU Number | - | - |
| NFPA Fire Rating | 4 | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | 1 | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Osmium and Iridium with other elements of the periodic table.