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Antimony |
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Pronunciation | |
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Appearance | sillery lustrous gray |
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Standard atomic weight Ar, std(Sb) | 7002121760000000000♠121.760(1)[1] |
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Antimony in the periodic cairt |
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Atomic nummer (Z) | 51 |
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Group | group 15 (pnictogens) |
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Period | period 5 |
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Block | p-block |
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Element category | Metalloid |
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Electron confeeguration | [Kr] 4d10 5s2 5p3 |
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Electrons per shell | 2, 8, 18, 18, 5 |
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Pheesical properties |
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Phase at STP | solit |
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Meltin pynt | 903.78 K (630.63 °C, 1167.13 °F) |
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Bylin pynt | 1860 K (1587 °C, 2889 °F) |
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Density (near r.t.) | 6.697 g/cm3 |
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when liquid (at m.p.) | 6.53 g/cm3 |
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Heat o fusion | 19.79 kJ/mol |
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Heat o vapourisation | 193.43 kJ/mol |
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Molar heat capacity | 25.23 J/(mol·K) |
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Vapour pressur
P (Pa)
|
1
|
10
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100
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1 k
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10 k
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100 k
|
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at T (K)
|
807
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876
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1011
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1219
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1491
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1858
|
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Atomic properties |
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Oxidation states | −3, −2, −1, 0,[2] +1, +2, +3, +4, +5 (an amphoteric oxide) |
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Electronegativity | Pauling scale: 2.05 |
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Ionisation energies | |
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Atomic radius | empirical: 140 pm |
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Covalent radius | 139±5 pm |
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Van der Waals radius | 206 pm |
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Spectral lines o antimony |
Ither properties |
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Naitural occurrence | primordial |
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Creestal structur | trigonal |
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Speed o soond thin rod | 3420 m/s (at 20 °C) |
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Thermal expansion | 11 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 24.4 W/(m·K) |
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Electrical resistivity | 417 n Ω·m (at 20 °C) |
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Magnetic orderin | diamagnetic[3] |
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Young's modulus | 55 GPa |
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Shear modulus | 20 GPa |
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Bulk modulus | 42 GPa |
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Mohs haurdness | 3.0 |
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Brinell haurdness | 294 MPa |
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CAS Nummer | 7440-36-0 |
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History |
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Diskivery | 3000 BC |
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First isolation | Vannoccio Biringuccio (1540) |
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Main isotopes o antimony |
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Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |