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 (Sb2S3). 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
51Sb
As

Sb

Bi
tinantimonytellurium
Ìhànsójú
silvery lustrous gray
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà antimony, Sb, 51
Ẹ̀ka ẹ́límẹ̀nti metalloid
Ẹgbẹ́, àsìkò, àdìpò 155, p
Ìwúwo átọ́mù 121.760(1)
Ìtòléra ẹ̀lẹ́ktrónì [Kr] 4d10 5s2 5p3
2, 8, 18, 18, 5
Physical properties
Phase solid
Density (near r.t.) 6.697 g·cm−3
Liquid density at m.p. 6.53 g·cm−3
Melting point 903.78 K, 630.63 °C, 1167.13 °F
Boiling point 1860 K, 1587 °C, 2889 °F
Heat of fusion 19.79 kJ·mol−1
Heat of vaporization 193.43 kJ·mol−1
Molar heat capacity 25.23 J·mol−1·K−1
Vapor 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 5, 3, -3
Electronegativity 2.05 (Pauling scale)
Ionization energies
(more)
1st: 834 kJ·mol−1
2nd: 1594.9 kJ·mol−1
3rd: 2440 kJ·mol−1
Atomic radius 140 pm
Covalent radius 139±5 pm
Van der Waals radius 206 pm
Miscellanea
Crystal structure rhombohedral
Antimony has a rhombohedral crystal structure
Magnetic ordering diamagnetic[1]
Electrical resistivity (20 °C) 417 nΩ·m
Thermal conductivity 24.4 W·m−1·K−1
Thermal expansion (25 °C) 11 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 3420 m·s−1
Young's modulus 55 GPa
Shear modulus 20 GPa
Bulk modulus 42 GPa
Mohs hardness 3.0
Brinell hardness 294 MPa
CAS registry number 7440-36-0
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù antimony
iso NA half-life DM DE (MeV) DP
121Sb 57.36% 121Sb is stable with 70 neutrons
123Sb 42.64% 123Sb is stable with 72 neutrons
125Sb syn 2.7582 y β 0.767 125Te
· r



ItokasiÀtúnṣe

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81th edition, CRC press.