Periodic Table Element Comparison: Compare Elements - Osmium vs Cesium
Compare Osmium and Cesium 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 Cesium with most reliable information about their properties, attributes, facts, uses etc. You can compare Os vs Cs on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Osmium and Cesium comparison table on more than 90 properties.
Osmium and Cesium Comparison
Facts
| Name | Osmium | Cesium |
|---|---|---|
| Atomic Number | 76 | 55 |
| Atomic Symbol | Os | Cs |
| Atomic Weight | 190.23 | 132.90545 |
| Phase at STP | Solid | Solid |
| Color | SlateGray | Silver |
| Metallic Classification | Transition Metal | Alkali Metal |
| Group in Periodic Table | group 8 | group 1 |
| Group Name | iron family | lithium family |
| Period in Periodic Table | period 6 | period 6 |
| Block in Periodic Table | d -block | s -block |
| Electronic Configuration | [Xe] 4f14 5d6 6s2 | [Xe] 6s1 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 14, 2 | 2, 8, 18, 18, 8, 1 |
| Melting Point | 3306 K | 301.59 K |
| Boiling Point | 5285 K | 944 K |
| CAS Number | CAS7440-04-2 | CAS7440-46-2 |
| Neighborhood Elements | Neighborhood Elements of Osmium | Neighborhood Elements of Cesium |
History
| Parameter | Osmium | Cesium |
|---|---|---|
| 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 Cesium was discovered by R. Bunsen and R. Kirchhoff in year 1860 in Germany. Cesium derived its name from the Latin caesius, meaning 'sky blue'. |
| Discovery | S. Tennant (1803) | R. Bunsen and R. Kirchhoff (1860) |
| Isolated | S. Tennant (1803) | C. Setterberg (1882) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Osmium | Cesium |
|---|---|---|
| Abundance in Universe | 3 / 0.02 | 0.8 / 0.01 |
| Abundance in Sun | 2 / 0.02 | 8 / 0.07 |
| Abundance in Meteorites | 670 / 70 | 140 / 20 |
| Abundance in Earth's Crust | 1.8 / 0.2 | 1900 / 290 |
| Abundance in Oceans | - / - | 0.5 / 0.023 |
| Abundance in Humans | - / - | 20 / 1 |
Crystal Structure and Atomic Structure
| Property | Osmium | Cesium |
|---|---|---|
| Atomic Volume | 8.421 cm3/mol | 70.732 cm3/mol |
| Atomic Radius | 185 pm | 298 pm |
| Covalent Radius | 128 pm | 225 pm |
| Van der Waals Radius | - | 343 pm |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  | Not available |
| Lattice Constant | 273.44, 273.44, 431.73 pm | 614.1, 614.1, 614.1 pm |
| Lattice Angle | π/2, π/2, 2 π/3 | π/2, π/2, π/2 |
| Space Group Name | P63/mmc | Im_ 3m |
| Space Group Number | 194 | 229 |
| Crystal Structure | Simple Hexagonal  | Body Centered Cubic  |
Atomic and Orbital Properties
| Property | Osmium | Cesium |
|---|---|---|
| Atomic Number | 76 | 55 |
| Number of Electrons (with no charge) | 76 | 55 |
| Number of Protons | 76 | 55 |
| Mass Number | 190.23 | 132.90545 |
| Number of Neutrons | 114 | 78 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 14, 2 | 2, 8, 18, 18, 8, 1 |
| Electron Configuration | [Xe] 4f14 5d6 6s2 | [Xe] 6s1 |
| Valence Electrons | 5d6 6s2 | 6s1 |
| Oxidation State | 4 | 1 |
| Atomic Term Symbol (Quantum Numbers) | 5D4 | 2S1/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Osmium has 6 stable naturally occuring isotopes while Cesium has 1 stable naturally occuring isotopes.
| Parameter | Osmium | Cesium |
|---|---|---|
| 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 | 112Cs, 113Cs, 114Cs, 115Cs, 116Cs, 117Cs, 118Cs, 119Cs, 120Cs, 121Cs, 122Cs, 123Cs, 124Cs, 125Cs, 126Cs, 127Cs, 128Cs, 129Cs, 130Cs, 131Cs, 132Cs, 133Cs, 134Cs, 135Cs, 136Cs, 137Cs, 138Cs, 139Cs, 140Cs, 141Cs, 142Cs, 143Cs, 144Cs, 145Cs, 146Cs, 147Cs, 148Cs, 149Cs, 150Cs, 151Cs |
| Stable Isotopes | Naturally occurring stable isotopes: 184Os, 187Os, 188Os, 189Os, 190Os, 192Os | Naturally occurring stable isotopes: 133Cs |
| Neutron Cross Section | 15 | 29 |
| Neutron Mass Absorption | 0.0023 | 0.0077 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Osmium | Cesium |
|---|---|---|
| Valence or Valency | 6 | 1 |
| Electronegativity | 2.2 Pauling Scale | 0.79 Pauling Scale |
| Electron Affinity | 106.1 kJ/mol | 45.5 kJ/mol |
| Ionization Energies | 1st: 840 kJ/mol 2nd: 1600 kJ/mol | 1st: 375.7 kJ/mol 2nd: 2234.3 kJ/mol 3rd: 3400 kJ/mol |
Physical Properties
| Property | Osmium | Cesium |
|---|---|---|
| Density | 22.59 g/cm3 | 1.879 g/cm3 |
| Molar Volume | 8.421 cm3/mol | 70.732 cm3/mol |
Elastic Properties | ||
| Young Modulus | - | 1.7 |
| Shear Modulus | 222 GPa | - |
| Bulk Modulus | - | 1.6 GPa |
| Poisson Ratio | 0.25 | - |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | 7 MPa | 0.2 MPa |
| Vickers Hardness | - | - |
| Brinell Hardness | 3920 MPa | 0.14 MPa |
Electrical Properties | ||
| Electrical Conductivity | 12000000 S/m | 5000000 S/m |
| Resistivity | 8.1e-8 m Ω | 2e-7 m Ω |
| Superconducting Point | 0.66 | - |
Heat and Conduction Properties | ||
| Thermal Conductivity | 88 W/(m K) | 36 W/(m K) |
| Thermal Expansion | 0.0000051 /K | - |
Magnetic Properties | ||
| Magnetic Type | Paramagnetic | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | 6e-10 m3/kg | 2.8e-9 m3/kg |
| Molar Magnetic Susceptibility | 1.1e-10 m3/mol | 3.72e-10 m3/mol |
| Volume Magnetic Susceptibility | 0.000014 | 0.00000526 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | 4940 m/s | - |
Thermal Properties - Enthalpies and thermodynamics
| Property | Osmium | Cesium |
|---|---|---|
| Melting Point | 3306 K | 301.59 K |
| Boiling Point | 5285 K | 944 K |
| Critical Temperature | - | 1938 K |
| Superconducting Point | 0.66 | - |
Enthalpies | ||
| Heat of Fusion | 31 kJ/mol | 2.09 kJ/mol |
| Heat of Vaporization | 630 kJ/mol | 65 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Osmium | Cesium |
|---|---|---|
| CAS Number | CAS7440-04-2 | CAS7440-46-2 |
| RTECS Number | RTECSRN1100000 | RTECSFK9225000 |
| DOT Hazard Class | 4.1 | 4.3 |
| DOT Numbers | 3089 | 1407 |
| EU Number | - | - |
| NFPA Fire Rating | 4 | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | 1 | - |
| NFPA Hazards | - | Water Reactive |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Osmium and Cesium with other elements of the periodic table.