
Rhodium (Rh) is a chemical element of the periodic table, located in the group 9 and the period 5, and is having the atomic number 45. It is a rare, lustrous, silvery-white transition metal, whose name comes from the Greek word “rhodon”, which means rose colored.
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– d block |
FAQs on Rhodium Element
Rhodium |
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‣ What does rhodium look like? Appearance: silvery white metallic |
‣ Who discovered rhodium? When was the element rhodium discovered? Discovery and first isolation: William Hyde Wollaston (1804) |
‣ What column is rhodium in on the periodic table?![]() Location: Rhodium is found in the ninth column of the periodic table, next to the ruthenium element. |
‣ What is the atomic number of rhodium? Atomic number (Z): 45 |
‣ What is rhodium symbol? Symbol: Rh |
‣ Rhodium atomic weight: 102.90549 |
‣ What block does rhodium belong to? Block: d-block |
‣ What group is rhodium in the periodic table? Group: 9 |
‣ What period is rhodium in the periodic table? Period: 5 |
‣ What is the atomic radius of rhodium? Atomic radius: empirical: 134 pm |
‣ Rhodium covalent radius: 142±7 pm |
‣ What is rhodium melting point? Melting point: 2237 K (1964 °C, 3567 °F) |
‣ What is the boiling point of rhodium? Boiling point: 3968 K (3695 °C, 6683 °F) |
‣ How many electrons does rhodium have? Electrons per shell: 2, 8, 18, 16, 1 |
‣ What is the electron configuration for rhodium? Electron configuration: [Kr] 4d8 5s1 |
‣ What is the ionization energy of rhodium? Ionization energies: 1st: 719.7 kJ/mol 2nd: 1740 kJ/mol 3rd: 2997 kJ/mol |
‣ What is the phase of rhodium? Phase (at r.t): solid |
‣ What is the rhodium density? Density (near r.t): 12.41 g/cm3 when liquid (at m.p): 10.7 g/cm3 |
‣ Rhodium magnetic ordering: paramagnetic |
‣ Rhodium natural occurrence: primordial |
‣ Rhodium oxidation state: +1, +2, +3, +4, +5, +6 |
‣ Rhodium electronegativity: Pauling scale: 2.28 |
‣ Rhodium poisson’s ratio: 0.26 |
‣ Rhodium heat of fusion: 26.59 kJ/mol |
‣ Rhodium heat of vaporization: 493 kJ/mol |
‣ Rhodium molar heat capacity: 24.98 J/(mol K) |
‣ Rhodium molar magnetic susceptibility: +111.0 × 10-6 cm3/mol (298 K) |
‣ Speed of sound in rhodium: 4700 m/s (at 20 °C) |
‣ Rhodium crystal structure: face-centered cubic (fcc) |
‣ Thermal expansion of rhodium: 8.2 µm/(m.K) (at 25 °C) |
‣ Thermal conductivity of rhodium: 150 W/(m.K) |
‣ Rhodium electrical resistivity: 43.3 nΩ.m (at 0 °C) |
‣ Rhodium hardness Mohs hardness: 6.0 Vickers hardness: 1100-8000 MPa Brinell hardness: 980-1350 MPa |
‣ Young’s modulus of rhodium: 380 GPa |
‣ Shear modulus of rhodium: 150 GPa |
‣ Bulk modulus of rhodium: 275 GPa |
‣ Rhodium CAS number: 7440-16-6 |
‣ Rhodium vapor pressure
Vapor pressure | ||||||
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P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 2288 | 2496 | 2749 | 3063 | 3405 | 3997 |
‣ How many isotopes does rhodium have?
Main isotopes of rhodium | ||||
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Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
99Rh | syn | 16.1 d | ε γ | 99Ru – |
101Rh | syn | 4.34 d | ε IT γ | 101Ru 101Rh – |
101Rh | syn | 3.3 y | ε γ | 101Ru – |
102Rh | syn | 3.7 y | ε γ | 102Ru – |
102Rh | syn | 207 d | ε β+ β– γ | 102Ru 102Ru 102Pd – |
103Rh | 100 % | stable | ||
105Rh | syn | 35.36 h | β– γ | 105Pd – |
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