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51Sb121.760
Antimony
MetalloidAntimony is a chemical element with symbol Sb (from Latin:stibium) 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 upon its discovery.
Phase: SolidAppearance: silvery lustrous gray
2, 8, 18, 18, 5
Physical Properties
Atomic Mass121.7601 u
Density6.697 g/cm³
Melting Point903.78 K
Boiling Point1908 K
Molar Heat25.23 J/(mol·K)
Period5
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3
Semantic Config[Kr] 4d10 5s2 5p3
Shells2, 8, 18, 18, 5
Electron Affinity101.059 kJ/mol
Electronegativity2.05
Ionization Energies
IE1: 834 kJ/molIE2: 1594.9 kJ/molIE3: 2440 kJ/molIE4: 4260 kJ/molIE5: 5400 kJ/molIE6: 10400 kJ/mol
Discovery
Discovered byunknown, before 3000 BC