Periodic System for Chemists

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Table
45
102.91

Rh

Rhodium

Identification

CAS Number: 7440-16-6
Discovery Year: 1803
Discoverer: William Wollaston
Discovery Location: England

Properties

Atomic Mass: 102.9055 →Density: 12.4 g/cm³ →
Crust Abundance: 0.001 mg/kg
Crystal Structure: FCC

Atomic Dimensions

Atomic Radius: 135 pm →
Atomic Radius (Rahm): 233 pm
Covalent Radius: 142 pm →
Van der Waals Radius: 210 pm
Metallic Radius: 125 pm
Atomic Volume: 8.3 cm³/mol
Lattice Constant: 3.8 Å

Thermodynamics

Melting Point: 2239 K →Boiling Point: 4000 K →Specific Heat: 0.244 J/(g·K) →Thermal Conductivity: 150 W/(m·K) →Heat of Fusion: 21.8 kJ/mol →Heat of Vaporization: 494 kJ/mol →
Heat of Formation: 556 kJ/mol

Electronic Structure

Electron Config: [Kr] 4d8 5s
Block: d
Period: 5 →Group: 9 →Electronegativity: 2.28 →Electron Affinity: 1.137 eV →
Oxidation States: +1, +2, +3, +4, +5

Abundance & Geochemistry

Crust Abundance: 0.001 mg/kg
Geochemical Class: noble metal
Goldschmidt Class: siderophile

About

Silvery white metallic transition element. Found with platinum and used in some platinum alloys. Not attacked by acids, dissolves only in aqua regia. Discovered in 1803 by W.H. Wollaston.

Isotopes

Rh-103 103 100.00%

Related Elements

Category

Transition Metals

Same Group

27 Co Cobalt77 Ir Iridium109 Mt Meitnerium

Same Period

42 Mo Molybdenum43 Tc Technetium44 Ru Ruthenium46 Pd Palladium47 Ag Silver48 Cd Cadmium

Periodic Trends

Electronegativity →Atomic Radius →Density →Melting Point →

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