Antimony

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 51
Element Antimony
Symbol Sb
Atomic Mass 121.760 u
Number of Neutrons 70 (most common isotope, Antimony-121)
Number of Protons 51
Number of Electrons 51
Period 5
Group 15
Phase Solid
Radioactive No
Natural Yes
Metal No
Nonmetal No
Metalloid Yes
Type Metalloid
Atomic Radius 133 pm
Electronegativity 2.05 (Pauling scale)
First Ionization Energy 8.608 eV
Density 6.68 g/cm³
Melting Point 630.63 °C
Boiling Point 1587 °C
Number of Isotopes 2 stable (Sb-121, Sb-123)
Discoverer Known since ancient times
Year Unknown
Specific Heat 0.207 J/g·K
Number of Shells 5
Number of Valence Electrons 5
Tags: Tutorials Chemistry tutorial step by step learn how to guide examples
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