Palladium, 46 Pd Palladium Pípè / p ə ˈ l eɪ d i ə m / (pə-LAY -dee-əm ) Ìhànsójú silvery white metallic Ìwúwo átọ̀mù A r, std (Pd) 106.42(1) Palladium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 46 Ẹgbẹ́ group 10 Àyè àyè 5 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Kr ] 4d10 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 18 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 1828.05 K (1554.9 °C, 2830.82 °F) Ígbà ìhó 3236 K (2963 °C, 5365 °F) Kíki (near r.t. ) 12.023 g/cm3 when liquid (at m.p. ) 10.38 g/cm3 Heat of fusion 16.74 kJ/mol Heat of 362 kJ/mol Molar heat capacity 25.98 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1721 1897 2117 2395 2753 3234
Atomic properties Oxidation states 0 , +1, +2 , +3, +4 Àdàkọ:Infobox element/symbol-to-oxidation-state/commentElectronegativity Pauling scale: 2.20 Atomic radius empirical: 137 pm Covalent radius 139±6 pm Van der Waals radius 163 pm Color lines in a spectral range Spectral lines of palladium Other properties Natural occurrence primordial Crystal structure (fcc) Speed of sound thin rod 3070 m/s (at 20 °C) Thermal expansion 11.8 µm/(m·K) (at 25 °C) Thermal conductivity 71.8 W/(m·K) Electrical resistivity 105.4 n Ω·m (at 20 °C) Magnetic ordering paramagnetic Young's modulus 121 GPa Shear modulus 44 GPa Bulk modulus 180 GPa Poisson ratio 0.39 Mohs hardness 4.75 Vickers hardness 461 MPa Brinell hardness 37.3 MPa CAS Number 7440-05-3 Main isotopes of palladium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 100 Pd syn 3.63 d ε - 100 Rh γ 0.084, 0.074,0.126 - 102 Pd 1.02% 102 Pd is stable with 56 neutrons 103 Pd syn 16.991 d ε - 103 Rh 104 Pd 11.14% 104 Pd is stable with 58 neutrons 105 Pd 22.33% 105 Pd is stable with 59 neutrons 106 Pd 27.33% 106 Pd is stable with 60 neutrons 107 Pd trace 6.5×106 y β− 0.033 107 Ag 108 Pd 26.46% 108 Pd is stable with 62 neutrons 110 Pd 11.72% 110 Pd is stable with 64 neutrons
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