Periodic Table Element Comparison: Compare Elements - Radium vs Rhodium
Compare Radium and Rhodium 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 Radium vs Rhodium with most reliable information about their properties, attributes, facts, uses etc. You can compare Ra vs Rh on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical conductivity and many more. Radium and Rhodium comparison table on more than 90 properties.
Radium and Rhodium Comparison
Facts
| Name | Radium | Rhodium |
|---|---|---|
| Atomic Number | 88 | 45 |
| Atomic Symbol | Ra | Rh |
| Atomic Weight | 226 | 102.9055 |
| Phase at STP | Solid | Solid |
| Color | Silver | Silver |
| Metallic Classification | Alkaline Earth Metal | Transition Metal |
| Group in Periodic Table | group 2 | group 9 |
| Group Name | beryllium family | cobalt family |
| Period in Periodic Table | period 7 | period 5 |
| Block in Periodic Table | s -block | d -block |
| Electronic Configuration | [Rn] 7s2 | [Kr] 4d8 5s1 |
| Electronic Shell Structure (Electrons per shell) | 2, 8, 18, 32, 18, 8, 2 | 2, 8, 18, 16, 1 |
| Melting Point | 973 K | 2237 K |
| Boiling Point | 2010 K | 3968 K |
| CAS Number | CAS7440-14-4 | CAS7440-16-6 |
| Neighborhood Elements | Neighborhood Elements of Radium | Neighborhood Elements of Rhodium |
History
| Parameter | Radium | Rhodium |
|---|---|---|
| History | The element Radium was discovered by P. and M. Curie in year 1898 in France. Radium derived its name from the Latin radius, 'ray'. | The element Rhodium was discovered by H. Wollaston in year 1804 in United Kingdom. Rhodium derived its name from the Greek rhodos, meaning 'rose coloured'. |
| Discovery | P. and M. Curie (1898) | H. Wollaston (1804) |
| Isolated | M. Curie (1902) | H. Wollaston (1804) |
Presence: Abundance in Nature and Around Us
Parts per billion (ppb) by weight / by atoms (1ppb =10^-7 %)
| Property | Radium | Rhodium |
|---|---|---|
| Abundance in Universe | - / - | 0.6 / 0.007 |
| Abundance in Sun | - / - | 2 / 0.02 |
| Abundance in Meteorites | - / - | 180 / 40 |
| Abundance in Earth's Crust | 0.00010 / 0.00001 | 0.70 / 0.1 |
| Abundance in Oceans | 0.00000001 / 0.0000000003 | - / - |
| Abundance in Humans | 0.000001 / 0.00000003 | - / - |
Crystal Structure and Atomic Structure
| Property | Radium | Rhodium |
|---|---|---|
| Atomic Volume | 41.09 cm3/mol | 8.2655 cm3/mol |
| Atomic Radius | - | 173 pm |
| Covalent Radius | - | 135 pm |
| Van der Waals Radius | 283 pm | - |
Atomic Spectrum - Spectral Lines | ||
| Emission Spectrum |  |  |
| Absorption Spectrum |  |  |
| Lattice Constant | 514.8, 514.8, 514.8 pm | 380.34, 380.34, 380.34 pm |
| Lattice Angle | π/2, π/2, π/2 | π/2, π/2, π/2 |
| Space Group Name | Im_ 3m | Fm_ 3m |
| Space Group Number | 229 | 225 |
| Crystal Structure | Body Centered Cubic  | Face Centered Cubic  |
Atomic and Orbital Properties
| Property | Radium | Rhodium |
|---|---|---|
| Atomic Number | 88 | 45 |
| Number of Electrons (with no charge) | 88 | 45 |
| Number of Protons | 88 | 45 |
| Mass Number | 226 | 102.9055 |
| Number of Neutrons | 138 | 58 |
| Shell structure (Electrons per energy level) | 2, 8, 18, 32, 18, 8, 2 | 2, 8, 18, 16, 1 |
| Electron Configuration | [Rn] 7s2 | [Kr] 4d8 5s1 |
| Valence Electrons | 7s2 | 4d8 5s1 |
| Oxidation State | 2 | 3 |
| Atomic Term Symbol (Quantum Numbers) | 1S0 | 4F9/2 |
| Shell structure |  |  |
Isotopes and Nuclear Properties
Radium has 0 stable naturally occuring isotopes while Rhodium has 1 stable naturally occuring isotopes.
| Parameter | Radium | Rhodium |
|---|---|---|
| Known Isotopes | 202Ra, 203Ra, 204Ra, 205Ra, 206Ra, 207Ra, 208Ra, 209Ra, 210Ra, 211Ra, 212Ra, 213Ra, 214Ra, 215Ra, 216Ra, 217Ra, 218Ra, 219Ra, 220Ra, 221Ra, 222Ra, 223Ra, 224Ra, 225Ra, 226Ra, 227Ra, 228Ra, 229Ra, 230Ra, 231Ra, 232Ra, 233Ra, 234Ra | 89Rh, 90Rh, 91Rh, 92Rh, 93Rh, 94Rh, 95Rh, 96Rh, 97Rh, 98Rh, 99Rh, 100Rh, 101Rh, 102Rh, 103Rh, 104Rh, 105Rh, 106Rh, 107Rh, 108Rh, 109Rh, 110Rh, 111Rh, 112Rh, 113Rh, 114Rh, 115Rh, 116Rh, 117Rh, 118Rh, 119Rh, 120Rh, 121Rh, 122Rh |
| Stable Isotopes | - | Naturally occurring stable isotopes: 103Rh |
| Neutron Cross Section | 20 | 145 |
| Neutron Mass Absorption | - | 0.063 |
Chemical Properties: Ionization Energies and electron affinity
| Property | Radium | Rhodium |
|---|---|---|
| Valence or Valency | 2 | 6 |
| Electronegativity | 0.9 Pauling Scale | 2.28 Pauling Scale |
| Electron Affinity | - | 109.7 kJ/mol |
| Ionization Energies | 1st: 509.3 kJ/mol 2nd: 979 kJ/mol | 1st: 719.7 kJ/mol 2nd: 1740 kJ/mol 3rd: 2997 kJ/mol |
Physical Properties
| Property | Radium | Rhodium |
|---|---|---|
| Density | 5 g/cm3 | 12.45 g/cm3 |
| Molar Volume | 41.09 cm3/mol | 8.2655 cm3/mol |
Elastic Properties | ||
| Young Modulus | - | 275 |
| Shear Modulus | - | 150 GPa |
| Bulk Modulus | - | 380 GPa |
| Poisson Ratio | - | 0.26 |
Hardness - Tests to Measure of Hardness of Element | ||
| Mohs Hardness | - | 6 MPa |
| Vickers Hardness | - | 1246 MPa |
| Brinell Hardness | - | 1100 MPa |
Electrical Properties | ||
| Electrical Conductivity | 1000000 S/m | 23000000 S/m |
| Resistivity | 0.000001 m Ω | 4.3e-8 m Ω |
| Superconducting Point | - | - |
Heat and Conduction Properties | ||
| Thermal Conductivity | 19 W/(m K) | 150 W/(m K) |
| Thermal Expansion | - | 0.0000082 /K |
Magnetic Properties | ||
| Magnetic Type | - | Paramagnetic |
| Curie Point | - | - |
| Mass Magnetic Susceptibility | - | 1.36e-8 m3/kg |
| Molar Magnetic Susceptibility | - | 1.4e-9 m3/mol |
| Volume Magnetic Susceptibility | - | 0.0001693 |
Optical Properties | ||
| Refractive Index | - | - |
Acoustic Properties | ||
| Speed of Sound | - | 4700 m/s |
Thermal Properties - Enthalpies and thermodynamics
| Property | Radium | Rhodium |
|---|---|---|
| Melting Point | 973 K | 2237 K |
| Boiling Point | 2010 K | 3968 K |
| Critical Temperature | - | - |
| Superconducting Point | - | - |
Enthalpies | ||
| Heat of Fusion | 8 kJ/mol | 21.7 kJ/mol |
| Heat of Vaporization | 125 kJ/mol | 495 kJ/mol |
| Heat of Combustion | - | - |
Regulatory and Health - Health and Safety Parameters and Guidelines
| Parameter | Radium | Rhodium |
|---|---|---|
| CAS Number | CAS7440-14-4 | CAS7440-16-6 |
| RTECS Number | - | RTECSVI9069000 |
| DOT Hazard Class | - | 4.1 |
| DOT Numbers | - | 3089 |
| EU Number | EU231-122-4 | - |
| NFPA Fire Rating | - | - |
| NFPA Health Rating | - | - |
| NFPA Reactivity Rating | - | - |
| NFPA Hazards | - | - |
| AutoIgnition Point | - | - |
| Flashpoint | - | - |
Compare With Other Elements
Compare Radium and Rhodium with other elements of the periodic table.