Compare Iridium vs Osmium: Periodic Table Element Comparison Table and Properties
Compare the elements Iridium and Osmium on the basis of their properties, attributes and periodic table facts. Compare elements - Iridium and Osmium comparison table side by side across over 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 Iridium vs Osmium with most reliable information about their properties, attributes, facts, uses etc. You can compare Ir vs Os on more than 90 properties like electronegativity, oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. This in-depth comparison helps students, educators, researchers, and science enthusiasts understand the differences and similarities between Iridium and Osmium.
Iridium and Osmium Comparison
Here's a detailed comparison between Iridium (Ir) and Osmium (Os), focusing on their position in the periodic table, physical and chemical properties, stability, and uses.
Facts - Basic Element Details
| Name | Iridium | Osmium |
|---|---|---|
| Atomic Number | 77 | 76 |
| Atomic Symbol | Ir | Os |
| Atomic Weight | 192.217 | 190.23 |
| Phase at STP | Solid | Solid |
| Color | Silver | SlateGray |
| Metallic Classification | Transition Metal | Transition Metal |
| Group in Periodic Table | group 9 | group 8 |
| Group Name | cobalt family | iron family |
| Period in Periodic Table | period 6 | period 6 |
| Block in Periodic Table | d -block | d -block |
| Electronic Configuration | [Xe] 4f14 5d7 6s2 | [Xe] 4f14 5d6 6s2 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 15, 2 | 2, 8, 18, 32, 14, 2 |
| Melting Point | 2739 K | 3306 K |
| Boiling Point | 4701 K | 5285 K |
| CAS Number | CAS7439-88-5 | CAS7440-04-2 |
| Neighborhood Elements | Neighborhood Elements of Iridium | Neighborhood Elements of Osmium |
History
| Parameter | Iridium | Osmium |
|---|---|---|
| History | 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. | The element Osmium was discovered by S. Tennant in year 1803 in United Kingdom. Osmium derived its name from the Greek osmè, meaning 'smell'. |
| 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 | Iridium | Osmium |
|---|---|---|
| Abundance in Universe | 2 / 0.01 | 3 / 0.02 |
| Abundance in Sun | 2 / 0.01 | 2 / 0.02 |
| Abundance in Meteorites | 550 / 60 | 670 / 70 |
| Abundance in Earth's Crust | 0.4 / 0.05 | 1.8 / 0.2 |
| Abundance in Oceans | - / - | - / - |
| Abundance in Humans | - / - | - / - |
Crystal Structure and Atomic Structure
| Property | Iridium | Osmium |
|---|---|---|
| Atomic Volume | 8.5203 cm3/mol | 8.421 cm3/mol |
| Atomic Radius | 180 pm | 185 pm |
| Covalent Radius | 137 pm | 128 pm |
| Van der Waals Radius | - | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 383.9, 383.9, 383.9 pm | 273.44, 273.44, 431.73 pm |
| Lattice Angle | π/2, π/2, π/2 | π/2, π/2, 2 π/3 |
| Space Group Name | Fm_ 3m | P63/mmc |
| Space Group Number | 225 | 194 |
| Crystal Structure | Face Centered Cubic  | Simple Hexagonal  |
Atomic and Orbital Properties
| Property | Iridium | Osmium |
|---|---|---|
| Atomic Number | 77 | 76 |
| Number of Electrons (with no charge) | 77 | 76 |
| Number of Protons | 77 | 76 |
| Mass Number | 192.217 | 190.23 |
| Number of Neutrons | 115 | 114 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 15, 2 | 2, 8, 18, 32, 14, 2 |
| Electron Configuration | [Xe] 4f14 5d7 6s2 | [Xe] 4f14 5d6 6s2 |
| Valence Electrons | 5d7 6s2 | 5d6 6s2 |
| Oxidation State | 3, 4 | 4 |
| Atomic Term Symbol (Quantum Numbers) | 4F9/2 | 5D4 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Iridium has 2 stable naturally occuring isotopes while Osmium has 6 stable naturally occuring isotopes.
| Parameter | Iridium | Osmium |
|---|---|---|
| Known Isotopes | 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 | 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 |
| Stable Isotopes | Naturally occurring stable isotopes: 191Ir, 193Ir | Naturally occurring stable isotopes: 184Os, 187Os, 188Os, 189Os, 190Os, 192Os |
| Neutron Cross Section | 425 | 15 |
| Neutron Mass Absorption | 0.08 | 0.0023 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Iridium | Osmium |
|---|---|---|
| Valence or Valency | 6 | 6 |
| Electronegativity | 2.2 Pauling Scale | 2.2 Pauling Scale |
| Oxidation State | 3, 4 | 4 |
| Electron Affinity | 151 kJ/mol | 106.1 kJ/mol |
| Ionization Energies | 1st: 880 kJ/mol 2nd: 1600 kJ/mol | 1st: 840 kJ/mol 2nd: 1600 kJ/mol |
Physical Properties
Iridium (22.56 g/cm³) is less dense than Osmium (22.59 g/cm³). This means that a given volume of Osmium will be heavier than the same volume of Iridium. Osmium is about 0.1 denser than Iridium
| Property | Iridium | Osmium |
|---|---|---|
| Phase at STP | Solid | Solid |
| Color | Silver | SlateGray |
| Density | 22.56 g/cm3 | 22.59 g/cm3 |
| Density (when liquid (at melting point)) | 19 g/cm3 | 20 g/cm3 |
| Molar Volume | 8.5203 cm3/mol | 8.421 cm3/mol |
Mechanical and Hardness Properties
| Property | Iridium | Osmium |
|---|---|---|
Elastic Properties | ||
| Young Modulus | 528 | - |
| Shear Modulus | 210 GPa | 222 GPa |
| Bulk Modulus | 320 GPa | - |
| Poisson Ratio | 0.26 | 0.25 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 6.5 MPa | 7 MPa |
| Vickers Hardness | 1760 MPa | - |
| Brinell Hardness | 1670 MPa | 3920 MPa |
Thermal and Electrical Conductivity
| Property | Iridium | Osmium |
|---|---|---|
Heat and Conduction Properties | ||
| Thermal Conductivity | 150 W/(m K) | 88 W/(m K) |
| Thermal Expansion | 0.0000064 /K | 0.0000051 /K |
Electrical Properties | ||
| Electrical Conductivity | 21000000 S/m | 12000000 S/m |
| Resistivity | 4.7e-8 m Ω | 8.1e-8 m Ω |
| Superconducting Point | 0.11 | 0.66 |
Magnetic and Optical Properties
| Property | Iridium | Osmium |
|---|---|---|
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 1.67e-9 m3/kg | 6e-10 m3/kg |
| Molar Magnetic Susceptibility | 3.21e-10 m3/mol | 1.1e-10 m3/mol |
| Volume Magnetic Susceptibility | 0.0000377 | 0.000014 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 4825 m/s | 4940 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Iridium | Osmium |
|---|---|---|
| Melting Point | 2739 K | 3306 K |
| Boiling Point | 4701 K | 5285 K |
| Critical Temperature | - | - |
| Superconducting Point | 0.11 | 0.66 |
Enthalpies | ||
| Heat of Fusion | 26 kJ/mol | 31 kJ/mol |
| Heat of Vaporization | 560 kJ/mol | 630 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Iridium | Osmium |
|---|---|---|
| CAS Number | CAS7439-88-5 | CAS7440-04-2 |
| 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 Iridium and Osmium With Other Elements
Compare Iridium and Osmium with other elements of the periodic table. Explore howIridium and Osmium stack up against other elements of the periodic table. Use our interactive comparison tool to analyze 90+ properties across different metals, non-metals, metalloids, and noble gases. Understanding these differences is crucial for applications in engineering, chemistry, electronics, biology, and material science.