Sodium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 11
Element Sodium
Symbol Na
Atomic Mass 22.990 u
Number of Neutrons 12 (most common isotope, Sodium-23)
Number of Protons 11
Number of Electrons 11
Period 3
Group 1
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Alkali Metal
Atomic Radius 190 pm
Electronegativity 0.93 (Pauling scale)
First Ionization Energy 5.139 eV
Density 0.971 g/cm³
Melting Point 97.79 °C
Boiling Point 883 °C
Number of Isotopes 1 stable (Sodium-23)
Discoverer Humphry Davy
Year 1807
Specific Heat 1.228 J/g·K
Number of Shells 3
Number of Valence Electrons 1
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