Symbol: Rh
Atomic Number: 45
Atomic Weight: 102.9055
Element Classification: Transition Metal
Discovered By: William Wollaston
Discovery Date: 1803 (England)
Name Origin: Greek: rhodon (rose). Its salts give a rosy solution.
Density (g/cc): 12.41
Melting Point (K): 2239
Boiling Point (K): 4000
Appearance: Silvery white, hard metal
Atomic Radius (pm): 134
Atomic Volume (cc/mol): 8.3
Covalent Radius (pm): 125
Ionic Radius: 68 (+3e)
Specific Heat (@20°C J/g mol): 0.244
Fusion Heat (kJ/mol): 21.8
Evaporation Heat (kJ/mol): 494
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 2.28
First Ionizing Energy (kJ/mol): 719.5
Oxidation States: 5, 4, 3, 2, 1, 0
Electronic Configuration: [Kr] 4d⁸ 5s¹
Lattice Structure: Face-Centered Cubic (FCC)
Lattice Constant (Å): 3.800
Lattice C/A Ratio: n/a