- Atomic Radius (Å)
Barium is a chemical element with symbol Ba and atomic number 56. It is the fifth element in Group 2, a soft silvery metallic alkaline earth metal. Because of its high chemical reactivity barium is never found in nature as a free element.
56 Atomic Number
137.33 u Atomic Mass
1002.15 K Melting Point
2170 K Boiling Point
3.51 g/cm³ Density
2.8 Å Atomic Radius
2.15 Å Covalent Radius
0.89 Electronegativity
5.21 eV First Ionization Energy
13.95 Electron Affinity
6 Number of Shells
2 Electron Valency
2, 8, 18, 18, 8, 2 Electron Shell Occupations
0.2 J/g Specific Heat