The chemical symbol for Rhodium is Rh and its atomic number is 45.
We find it listed in the periodic table in Group 9 and period 5 and block d.
Rhodium belongs to the family of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is stable.
Rhodium as a name came from the greek word rhodon which means pink.
Atomic number (Z) 45
Group, block group 9, d-block
Period: period 5
Element category: transition metal
Standard atomic weight (±) (Ar) 102.90550(2)
Electron configuration: [Kr] 4d8 5s1
per shell: 2, 8, 18, 16, 1
Physical properties
Phase: solid
Melting point: 2237 K (1964 °C, 3567 °F)
Boiling point: 3968 K (3695 °C, 6683 °F)
Density near r.t. : 12.41 g/cm3
when liquid, at m.p. 10.7 g/cm3
Heat of fusion: 26.59 kJ/mol
Heat of vaporization: 493 kJ/mol
Molar heat capacity: 24.98 J/(mol·K)
Atomic properties
Oxidation states: 6, 5, 4, 3, 2, 1, −1, −3 (an amphoteric oxide)
Electronegativity: Pauling scale: 2.28
Ionization energies 1st: 719.7 kJ/mol
2nd: 1740 kJ/mol
3rd: 2997 kJ/mol
Atomic radius empirical: 134 pm
Covalent radius: 142±7 pm
Element Crystal structure: face-centered cubic
Speed of sound thin rod: 4700 m/s (at 20 °C)
Thermal expansion 8.2 µm/(m·K) (at 25 °C)
Thermal conductivity: 150 W/(m·K)
Electrical resistivity: 43.3 nΩ·m (at 0 °C)
Magnetic ordering: paramagnetic
Young's modulus:380 GPa
Shear modulus: 150 GPa
Bulk modulus: 275 GPa
Poisson ratio: 0.26
Mohs hardness: 6.0
Vickers hardness: 1100–8000 MPa
Brinell hardness: 980–1350 MPa
CAS Number: 7440-16-6