Rhodium

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Rhodium
45Rh
Co

Rh

Ir
rutheniumrhodiumpalladium
Ìhànsójú
silvery white metallic
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà rhodium, Rh, 45
Ìpèlóhùn /ˈroʊdiəm/ ROH-dee-əm
Ẹ̀ka ẹ́límẹ̀nti transition metal
Ẹgbẹ́, àsìkò, àdìpò 95, d
Ìwúwo átọ́mù 102.90550
Ìtòléra ẹ̀lẹ́ktrónì [Kr] 4d8 5s1
2, 8, 18, 16, 1
Physical properties
Phase solid
Density (near r.t.) 12.41 g·cm−3
Liquid density at m.p. 10.7 g·cm−3
Melting point 2237 K, 1964 °C, 3567 °F
Boiling point 3968 K, 3695 °C, 6683 °F
Heat of fusion 26.59 kJ·mol−1
Heat of vaporization 494 kJ·mol−1
Molar heat capacity 24.98 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 2288 2496 2749 3063 3405 3997
Atomic properties
Oxidation states 6, 5, 4, 3, 2, 1[1], -1
(amphoteric oxide)
Electronegativity 2.28 (Pauling scale)
Ionization energies 1st: 719.7 kJ·mol−1
2nd: 1740 kJ·mol−1
3rd: 2997 kJ·mol−1
Atomic radius 134 pm
Covalent radius 142±7 pm
Miscellanea
Crystal structure face-centered cubic
Rhodium has a face-centered cubic crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (0 °C) 43.3 nΩ·m
Thermal conductivity 150 W·m−1·K−1
Thermal expansion (25 °C) 8.2 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 4700 m·s−1
Young's modulus 380 GPa
Shear modulus 150 GPa
Bulk modulus 275 GPa
Poisson ratio 0.26
Mohs hardness 6.0
Vickers hardness 1246 MPa
Brinell hardness 1100 MPa
CAS registry number 7440-16-6
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù rhodium
iso NA half-life DM DE (MeV) DP
99Rh syn 16.1 d ε - 99Ru
γ 0.089, 0.353,
0.528
-
101mRh syn 4.34 d ε - 101Ru
IT 0.157 101Rh
γ 0.306, 0.545 -
101Rh syn 3.3 y ε - 101Ru
γ 0.127, 0.198,
0.325
-
102mRh syn 2.9 y ε - 102Ru
γ 0.475, 0.631,
0.697, 1.046
-
102Rh syn 207 d ε - 102Ru
β+ 0.826, 1.301 102Ru
β 1.151 102Pd
γ 0.475, 0.628 -
103Rh 100% 103Rh is stable with 58 neutrons
105Rh syn 35.36 h β 0.247, 0.260,
0.566
105Pd
γ 0.306, 0.318 -
· r


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. "Rhodium: rhodium(I) fluoride compound data". OpenMOPAC.net. http://openmopac.net/data_normal/rhfr_jmol.html. Retrieved 2007-12-10. 
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.