Template:Infobox antimony

Antimony,  ₅₁Sb

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery lustrous gray
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Antimony in the periodic table
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Atomic number (Z)	51
Group	Template:Infobox element/group
Period	period 5
Block	p-block
Element category	Template:Infobox element/category format
Electron configuration	[Kr] 4d10 5s2 5p3
Electrons per shell	2, 8, 18, 18, 5
Physical properties
Phase at STP	solid
Melting point	903.78 K ​(630.63 °C, ​1167.13 °F)
Boiling point	1908 K ​(1635 °C, ​2975 °F)
Density (near r.t.)	6.697 g/cm3
when liquid (at m.p.)	6.53 g/cm3
Heat of fusion	19.79 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	193.43 kJ/mol
Molar heat capacity	25.23 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.05
[[Ionization energy|Template:Engvar energies]]	1st: 834 kJ/mol 2nd: 1594.9 kJ/mol 3rd: 2440 kJ/mol (more)
Atomic radius	empirical: 140 pm
Covalent radius	139±5 pm
Van der Waals radius	206 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
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 nΩ·m (at 20 °C)
Magnetic ordering	diamagnetic
Magnetic susceptibility	−99.0·10−6 cm3/mol
Young's modulus	55 GPa
Shear modulus	20 GPa
Bulk modulus	42 GPa
Mohs hardness	3.0
Brinell hardness	294–384 MPa
CAS Number	7440-36-0
History
Discovery	before 800 CE
Main isotopes of antimony
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