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عمومي خواص |
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Pronunciation | /ˈkædmiəm/ KAD-mee-əm |
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Appearance | silvery bluish-gray metallic |
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Cadmium پهدوراني جدول کې |
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اټومي شمیره(Z) | 48 |
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گروپ,پیریود | group 12,period 5 |
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بلاک | d-block |
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Element category | transition metal, alternatively considered apost-transition metal |
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معياري اټومي وزن (Ar) | کينډۍ:Val[۱] |
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Electron configuration | [Kr] 4d10 5s2 |
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Electrons per shell | 2, 8, 18, 18, 2 |
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فزیکي خواص |
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حالت(at STP) | جامد |
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دويلې کيدو ټکى | 594.22 K (321.07 °C, 609.93 °F) |
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يشنا ټکی | 1040 K (767 °C, 1413 °F) |
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Density near r.t. | 8.65 g/cm3 |
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when liquid, at m.p. | 7.996 g/cm3 |
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Heat of fusion | 6.21 kJ/mol |
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Heat of vaporization | 99.87 kJ/mol |
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Molar heat capacity | 26.020 J/(mol·K) |
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Vapor pressure |
اټومي خواص |
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Oxidation states | 2, 1, −2 (a mildlybasic oxide) |
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Electronegativity | Pauling scale: 1.69 |
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Ionization energies | - 1st: 867.8 kJ/mol
- 2nd: 1631.4 kJ/mol
- 3rd: 3616 kJ/mol
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Atomic radius | empirical: 151 pm |
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Covalent radius | 144±9 pm |
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Van der Waals radius | 158 pm |
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Miscellanea |
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Crystal structure | hexagonal close-packed (hcp) Hexagonal close packed crystal structure for cadmium |
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Speed of sound thin rod | 2310 m/s (at 20 °C) |
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Thermal expansion | 30.8 µm/(m·K) (at 25 °C) |
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د تودوخې تېرېدنه | 96.6 W/(m·K) |
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Electrical resistivity | 72.7 nΩ·m (at 22 °C) |
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Magnetic ordering | diamagnetic[۲] |
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Magnetic susceptibility(χmol) | −19.8·10−6 cm3/mol[۳] |
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Young's modulus | 50 GPa |
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Shear modulus | 19 GPa |
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Bulk modulus | 42 GPa |
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Poisson ratio | 0.30 |
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Mohs hardness | 2.0 |
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Brinell hardness | 203–220 MPa |
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CAS Number | 7440-43-9 |
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History |
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Discovery and first isolation | Karl Samuel Leberecht Hermann andFriedrich Stromeyer (1817) |
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Named by | Friedrich Stromeyer (1817) |
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Mainisotopes of cadmium |
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| references | in Wikidata |