Antimony
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Antimony

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Antimony is a chemical element with the symbol Sb (from Latin stibium) and atomic number 51. A lustrous grey metal or metalloid, it occurs in nature mainly in the form of the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name kohl. China is the largest producer of antimony and

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Antimony, 51Sb
Antimony
Pronunciation
Appearancesilvery lustrous gray
Standard atomic weight Ar°(Sb)
Antimony in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
As
↑
Sb
↓
Bi
tin ← antimony → tellurium
Atomic number (Z)51
Groupgroup 15 (pnictogens)
Periodperiod 5
Block  p-block
Electron configuration[Kr] 4d 5s 5p
Electrons per shell2, 8, 18, 18, 5
Physical properties
Phase at STPsolid
Melting point903.78 K ​(630.63 °C, ​1167.13 °F)
Boiling point1908 K ​(1635 °C, ​2975 °F)
Density (at 20° C)6.694 g/cm
when liquid (at m.p.)6.53 g/cm
Heat of fusion19.79 kJ/mol
Heat of vaporization193.43 kJ/mol
Molar heat capacity25.23 J/(mol·K)
Specific heat capacity207.211 J/(kg·K)
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 statescommon: −3, +3, +5
−2, −1, 0, +1, +2, +4
ElectronegativityPauling scale: 2.05
Ionization energies
  • 1st: 834 kJ/mol
  • 2nd: 1594.9 kJ/mol
  • 3rd: 2440 kJ/mol
  • (more)
Atomic radiusempirical: 140 pm
Covalent radius139±5 pm
Van der Waals radius206 pm
Color lines in a spectral range
Spectral lines of antimony
Other properties
Natural occurrenceprimordial
Crystal structure ​rhombohedral (hR2)
Lattice constants
Rhombohedral crystal structure for antimony
a = 0.45066 nm
α = 57.112°
ah = 0.43084 nm
ch = 1.12736 nm (at 20 °C)
Thermal expansion11.04×10/K (at 20 °C)
Thermal conductivity24.4 W/(m⋅K)
Electrical resistivity417 nΩ⋅m (at 20 °C)
Magnetic orderingdiamagnetic
Molar magnetic susceptibility−99.0×10 cm/mol
Young's modulus55 GPa
Shear modulus20 GPa
Bulk modulus42 GPa
Speed of sound thin rod3420 m/s (at 20 °C)
Mohs hardness3.0
Brinell hardness294–384 MPa
CAS Number7440-36-0
History
NamingUncertain. Possibly from Greek anti ("not") + monos ("alone"), for not occurring alone in nature
DiscoveryArabic alchemists (before AD 815)
Symbol"Sb": from Latin stibium 'stibnite'
Isotopes of antimony
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
Sb 57.2% stable
Sb 42.8% stable
Sb synth 2.758 y β Te
 Category: Antimony
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