Barium

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 56
Element Barium
Symbol Ba
Atomic Mass 137.327 u
Number of Neutrons 81 (most common isotope, Barium-138)
Number of Protons 56
Number of Electrons 56
Period 6
Group 2
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Alkaline Earth Metal
Atomic Radius 253 pm
Electronegativity 0.89 (Pauling scale)
First Ionization Energy 5.212 eV
Density 3.62 g/cm³
Melting Point 727 °C
Boiling Point 1897 °C
Number of Isotopes 7 stable (Ba-130, Ba-132, Ba-134, Ba-135, Ba-136, Ba-137, Ba-138)
Discoverer Carl Wilhelm Scheele
Year 1774
Specific Heat 0.204 J/g·K
Number of Shells 6
Number of Valence Electrons 2
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