Rhodium element properties

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Name: Rhodium Symbol: Rh
Group: Trans. Met. Atomic weight: 102.9055
Density @ 293 K: 12.4 g/cm3 Atomic volume: 8.3 cm3/mol
Group: Trans. Met. discovered: 1803


state (s, l, g): s
melting point: 2238.2 K boiling point: 4033 K
Heat of fusion: 21.50 kJ/mol Heat of vaporization: 493.0 kJ/mol


1st ionization energy: 719.8 kJ/mole
electronegativity: 2.28 2nd ionization energy: 1744.4 kJ/mole
electron affinity: 109.7 kJ/mole 3rd ionization energy: 2996.8 kJ/mole
Specific heat: 0.242 J/gK heat atomization: 556 kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,16,1 electron configuration: [Kr] 4d8 5s1
minimum oxidation number: -1 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 3

Appearance & Characteristics:

structure: fcc: face-centered cubic color: silvery-white
uses: catalysts, elec. contacts toxicity:
hardness: mohs characteristics: forms hard coatings


reaction with air: none, w/ht =>Rh2O3
reaction with 6M HCl: none reaction with 6M HCl: none
reaction with 15M HNO3: none reaction with 6M NaOH: none

Other Forms:

number of isotopes: 1 hydride(s): none
oxide(s): Rh2O3 RhO2 chloride(s): RhCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 134 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 80.5 pm


thermal conductivity: 150 J/m-sec-deg
electrical conductivity: 221.729 1/mohm-cm polarizability: 8.6 A^3


source: nickel ores (sulfides)
rel. abund. solar system: -0.463 log abundance earth's crust: -3 log
cost, pure: 13000 $/100g cost, bulk: $/100g

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