Antimony (Látìnì : stibium ) is a chemical element with symbol Sb and atomic number 51. A lustrous gray metalloid , it is found in nature mainly as the sulfide mineral stibnite (Sb2 S3 ). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead . It was established to be an element around the 17th century.
Antimony, 51 Antimony Pípè Ìhànsójú silvery lustrous gray Ìwúwo átọ̀mù A r, std (Sb) 121.760(1) [1] Antimony ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 51 Ẹgbẹ́ group 15 (pnictogens) Àyè àyè 5 Àdìpọ̀ Àdìpọ̀-p Ẹ̀ka ẹ́límẹ́ntì Metalloid Ìtò ẹ̀lẹ́ktrọ́nù [Kr ] 4d10 5s2 5p3 Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 18, 5 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 903.78 K (630.63 °C, 1167.13 °F) Ígbà ìhó 1860 K (1587 °C, 2889 °F) Kíki (near r.t. ) 6.697 g/cm3 when liquid (at m.p. ) 6.53 g/cm3 Heat of fusion 19.79 kJ/mol Heat of 193.43 kJ/mol Molar heat capacity 25.23 J/(mol·K) pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 807 876 1011 1219 1491 1858
Atomic properties Oxidation states −3 [2] +3 +5 Electronegativity Pauling scale: 2.05 energies Atomic radius empirical: 140 pm Covalent radius 139±5 pm Van der Waals radius 206 pm Color lines in a spectral range Spectral lines of antimony Other properties Natural occurrence primordial Crystal structure rhombohedral Speed of sound thin rod 3420 m/s (at 20 °C) Thermal expansion 11 µm/(m·K) (at 25 °C) Thermal conductivity 24.4 W/(m·K) Electrical resistivity 417 n Ω·m (at 20 °C) Magnetic ordering diamagnetic[3] Young's modulus 55 GPa Shear modulus 20 GPa Bulk modulus 42 GPa Mohs hardness 3.0 Brinell hardness 294 MPa CAS Number 7440-36-0 Main isotopes of antimony Isotope Abundance Half-life (t 1/2 ) Decay mode Product 121 Sb57.36% 121 Sb is stable with 70 neutrons123 Sb42.64% 123 Sb is stable with 72 neutrons125 Sbsyn 2.7582 y β− 0.767 125 Te
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