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|Neutron Number (N)||70||72|
|Atomic Number / Proton Number (Z)||51||51|
|Mass Number / Nucleon Number (A)||121||123|
|Natural Abundance (%)||0.5721||0.4279|
|Atomic Mass (Da)||120.90381||122.90421|
|Relative Isotopic Mass||120.90381||122.90421|
|g-factor (g value)||1.3454||0.72851|
|Electron Configuration Block||p||p|
|Melting Point (K)||903.9||903.9|
|Boiling Point (K)||1908||1908|
|Heat of Formation||264.4||264.4|
|Electron Affinity (kJ/mole)||1.046||1.046|
|Electronegativity (Pauling scale)||2.05||2.05|
|Atomic Radius (pm)||159||159|
|Covalent Radius (pm)||145||145|
|VDW Radius (pm)||252||252|
Element of group 15. Multiple allotropic forms. The stable form of antimony is a blue-white metal. Yellow and black antimony are unstable non-metals. Used in flame-proofing, paints, ceramics, enamels, and rubber. Attacked by oxidizing acids and halogens. First reported by Tholden in 1450.
It is alloyed with other metals to increase their hardness. Also in the manufacture of a few special types of semiconductor devices. Also in plastics and chemicals. A few kinds of over-the-counter cold and flu remedies use antimony compounds.