- 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