Compare Iridium vs Astatine: Periodic Table Element Comparison Table and Properties
Compare the elements Iridium and Astatine on the basis of their properties, attributes and periodic table facts. Compare elements - Iridium and Astatine 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 Astatine with most reliable information about their properties, attributes, facts, uses etc. You can compare Ir vs At 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 Astatine.
Iridium and Astatine Comparison
Here's a detailed comparison between Iridium (Ir) and Astatine (At), focusing on their position in the periodic table, physical and chemical properties, stability, and uses.
Facts - Basic Element Details
| Name | Iridium | Astatine |
|---|---|---|
| Atomic Number | 77 | 85 |
| Atomic Symbol | Ir | At |
| Atomic Weight | 192.217 | 210 |
| Phase at STP | Solid | Solid |
| Color | Silver | Silver |
| Metallic Classification | Transition Metal | Halogens |
| Group in Periodic Table | group 9 | group 17 |
| Group Name | cobalt family | fluorine family |
| Period in Periodic Table | period 6 | period 6 |
| Block in Periodic Table | d -block | p -block |
| Electronic Configuration | [Xe] 4f14 5d7 6s2 | [Xe] 4f14 5d10 6s2 6p5 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 15, 2 | 2, 8, 18, 32, 18, 7 |
| Melting Point | 2739 K | 575 K |
| Boiling Point | 4701 K | - |
| CAS Number | CAS7439-88-5 | CAS7440-68-8 |
| Neighborhood Elements | Neighborhood Elements of Iridium | Neighborhood Elements of Astatine |
History
| Parameter | Iridium | Astatine |
|---|---|---|
| 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 Astatine was discovered by R. Corson,R. MacKenzie and E. Segrè in year 1940 in United States. Astatine derived its name from the Greek astatos, 'unstable'. |
| Discovery | S. Tennant (1803) | R. Corson,R. MacKenzie and E. Segrè (1940) |
| Isolated | S. Tennant (1803) | () |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Iridium | Astatine |
|---|---|---|
| Abundance in Universe | 2 / 0.01 | - / - |
| Abundance in Sun | 2 / 0.01 | - / - |
| Abundance in Meteorites | 550 / 60 | - / - |
| Abundance in Earth's Crust | 0.4 / 0.05 | - / - |
| Abundance in Oceans | - / - | - / - |
| Abundance in Humans | - / - | - / - |
Crystal Structure and Atomic Structure
| Property | Iridium | Astatine |
|---|---|---|
| Atomic Volume | 8.5203 cm3/mol | - |
| Atomic Radius | 180 pm | 127 pm |
| Covalent Radius | 137 pm | - |
| Van der Waals Radius | - | 202 pm |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  | Not available |
| Absorption Spectrum |  | Not available |
| Lattice Constant | 383.9, 383.9, 383.9 pm | - |
| Lattice Angle | π/2, π/2, π/2 | - |
| Space Group Name | Fm_ 3m | - |
| Space Group Number | 225 | - |
| Crystal Structure | Face Centered Cubic  | Face Centered Cubic |
Atomic and Orbital Properties
| Property | Iridium | Astatine |
|---|---|---|
| Atomic Number | 77 | 85 |
| Number of Electrons (with no charge) | 77 | 85 |
| Number of Protons | 77 | 85 |
| Mass Number | 192.217 | 210 |
| Number of Neutrons | 115 | 125 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 15, 2 | 2, 8, 18, 32, 18, 7 |
| Electron Configuration | [Xe] 4f14 5d7 6s2 | [Xe] 4f14 5d10 6s2 6p5 |
| Valence Electrons | 5d7 6s2 | 6s2 6p5 |
| Oxidation State | 3, 4 | -1, 1 |
| Atomic Term Symbol (Quantum Numbers) | 4F9/2 | 2P3/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Iridium has 2 stable naturally occuring isotopes while Astatine has 0 stable naturally occuring isotopes.
| Parameter | Iridium | Astatine |
|---|---|---|
| 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 | 193At, 194At, 195At, 196At, 197At, 198At, 199At, 200At, 201At, 202At, 203At, 204At, 205At, 206At, 207At, 208At, 209At, 210At, 211At, 212At, 213At, 214At, 215At, 216At, 217At, 218At, 219At, 220At, 221At, 222At, 223At |
| Stable Isotopes | Naturally occurring stable isotopes: 191Ir, 193Ir | |
| Neutron Cross Section | 425 | - |
| Neutron Mass Absorption | 0.08 | - |
Chemical Properties: Ionization Energies and electron affinity
| Property | Iridium | Astatine |
|---|---|---|
| Valence or Valency | 6 | 7 |
| Electronegativity | 2.2 Pauling Scale | 2.2 Pauling Scale |
| Oxidation State | 3, 4 | -1, 1 |
| Electron Affinity | 151 kJ/mol | 270.1 kJ/mol |
| Ionization Energies | 1st: 880 kJ/mol 2nd: 1600 kJ/mol | 1st: 899.003 kJ/mol |
Physical Properties
| Property | Iridium | Astatine |
|---|---|---|
| Phase at STP | Solid | Solid |
| Color | Silver | Silver |
| Density | 22.56 g/cm3 | - |
| Density (when liquid (at melting point)) | 19 g/cm3 | - |
| Molar Volume | 8.5203 cm3/mol | - |
Mechanical and Hardness Properties
| Property | Iridium | Astatine |
|---|---|---|
Elastic Properties | ||
| Young Modulus | 528 | - |
| Shear Modulus | 210 GPa | - |
| Bulk Modulus | 320 GPa | - |
| Poisson Ratio | 0.26 | - |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 6.5 MPa | - |
| Vickers Hardness | 1760 MPa | - |
| Brinell Hardness | 1670 MPa | - |
Thermal and Electrical Conductivity
| Property | Iridium | Astatine |
|---|---|---|
Heat and Conduction Properties | ||
| Thermal Conductivity | 150 W/(m K) | 2 W/(m K) |
| Thermal Expansion | 0.0000064 /K | - |
Electrical Properties | ||
| Electrical Conductivity | 21000000 S/m | - |
| Resistivity | 4.7e-8 m Ω | - |
| Superconducting Point | 0.11 | - |
Magnetic and Optical Properties
| Property | Iridium | Astatine |
|---|---|---|
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | - |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 1.67e-9 m3/kg | - |
| Molar Magnetic Susceptibility | 3.21e-10 m3/mol | - |
| Volume Magnetic Susceptibility | 0.0000377 | - |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 4825 m/s | - |
Thermal Properties - Enthalpies and thermodynamics
| Property | Iridium | Astatine |
|---|---|---|
| Melting Point | 2739 K | 575 K |
| Boiling Point | 4701 K | - |
| Critical Temperature | - | - |
| Superconducting Point | 0.11 | - |
Enthalpies | ||
| Heat of Fusion | 26 kJ/mol | 6 kJ/mol |
| Heat of Vaporization | 560 kJ/mol | 40 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Iridium | Astatine |
|---|---|---|
| CAS Number | CAS7439-88-5 | CAS7440-68-8 |
| RTECS Number | - | - |
| DOT Hazard Class | 4.1 | - |
| DOT Numbers | 3089 | - |
| EU Number | - | - |
| NFPA Fire Rating | - | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | - | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare Iridium and Astatine With Other Elements
Compare Iridium and Astatine with other elements of the periodic table. Explore howIridium and Astatine 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.