Cadmium, 48 Cadmium Pípè / ˈ k æ d m i ə m / (KAD -mee-əm Ìhànsójú silvery gray metallic Ìwúwo átọ̀mù A r, std (Cd) 112.414(4) Cadmium ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 48 Ẹgbẹ́ group 12 Àyè àyè 5 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Post-transition metalÌtò ẹ̀lẹ́ktrọ́nù [Kr ] 4d10 5s2 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 18, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 594.22 K (321.07 °C, 609.93 °F) Ígbà ìhó 1040 K (767 °C, 1413 °F) Kíki (near r.t. ) 8.65 g/cm3 when liquid (at m.p. ) 7.996 g/cm3 Heat of fusion 6.21 kJ/mol Heat of 99.87 kJ/mol Molar heat capacity 26.020 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 530 583 654 745 867 1040
Atomic properties Oxidation states −2, +1, +2 Electronegativity Pauling scale: 1.69 Atomic radius empirical: 151 pm Covalent radius 144±9 pm Van der Waals radius 158 pm Color lines in a spectral range Spectral lines of cadmium Other properties Natural occurrence primordial Crystal structure hexagonal Speed of sound thin rod 2310 m/s (at 20 °C) Thermal expansion 30.8 µm/(m·K) (at 25 °C) Thermal conductivity 96.6 W/(m·K) Electrical resistivity (22 °C) 72.7 n Ω·m Magnetic ordering diamagnetic Young's modulus 50 GPa Shear modulus 19 GPa Bulk modulus 42 GPa Poisson ratio 0.30 Mohs hardness 2.0 Brinell hardness 203 MPa CAS Number 7440-43-9 Main isotopes of cadmium Isotope Abundance Half-life (t 1/2 ) Decay mode Product 106 Cd 1.25% >9.5×1017 y εε2ν - 106 Pd 107 Cd syn 6.5 h ε 1.417 107 Ag 108 Cd 0.89% >6.7×1017 y εε2ν - 108 Pd 109 Cd syn 462.6 d ε 0.214 109 Ag 110 Cd 12.49% 110 Cd is stable with 62 neutrons 111 Cd 12.8% 111 Cd is stable with 63 neutrons 112 Cd 24.13% 112 Cd is stable with 64 neutrons 113 Cd 12.22% 7.7×1015 y β− 0.316 113 In 113m Cd syn 14.1 y β− 0.580 113 In IT 0.264 113 Cd 114 Cd 28.73% >9.3×1017 y ββ2ν - 114 Sn 115 Cd syn 53.46 h β− 1.446 115 In 116 Cd 7.49% 2.9×1019 y ββ2ν - 116 Sn
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