IHE Wiki
Posted on July 23, 2020
By Robert Payne
Rhodium, 45 Rh Rhodium Pípè / ˈ r oʊ d i ə m / (ROH -dee-əm ) Ìhànsójú silvery white metallic Ìwúwo átọ̀mù A r, std (Rh) 102.9054 9(2) [1] Rhodium ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 45 Ẹgbẹ́ group 9 Àyè àyè 5 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metal Ìtò ẹ̀lẹ́ktrọ́nù [Kr ] 4d8 5s1 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 16, 1 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 2237 K (1964 °C, 3567 °F) Ígbà ìhó 3968 K (3695 °C, 6683 °F) Kíki (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 494 kJ/mol Molar heat capacity 24.98 J/(mol·K) 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 −3, −1, 0, +1,[2] +2, +3 , +4, +5, +6 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 2.28 Atomic radius empirical: 134 pm Covalent radius 142±7 pm Color lines in a spectral range Spectral lines of rhodiumOther properties Natural occurrence primordial Crystal structure (fcc) 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 n Ω·m (at 0 °C) Magnetic ordering paramagnetic [3] 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 Number 7440-16-6 Main isotopes of rhodium
Isotope
Abundance
Half-life (t 1/2 )
Decay mode
Product
99 Rh
syn
16.1 d
ε
-
99 Ru
γ
0.089, 0.353, 0.528
-
101m Rh
syn
4.34 d
ε
-
101 Ru
IT
0.157
101 Rh
γ
0.306, 0.545
-
101 Rh
syn
3.3 y
ε
-
101 Ru
γ
0.127, 0.198, 0.325
-
102m Rh
syn
2.9 y
ε
-
102 Ru
γ
0.475, 0.631, 0.697, 1.046
-
102 Rh
syn
207 d
ε
-
102 Ru
β+
0.826, 1.301
102 Ru
β−
1.151
102 Pd
γ
0.475, 0.628
-
103 Rh
100%
103 Rh is stable with 58 neutrons
105 Rh
syn
35.36 h
β−
0.247, 0.260, 0.566
105 Pd
γ
0.306, 0.318
-
Àdàkọ:Category-inline | references
Itokasi
↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305 .
↑ "Rhodium: rhodium(I) fluoride compound data" . OpenMOPAC.net. Retrieved 2007-12-10 .
↑ Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press.
↑ "Rhodium: rhodium(I) fluoride compound data" . OpenMOPAC.net. Retrieved 2007-12-10 .