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56 - Barium alkaline earth metal

Discovered by Carl Wilhelm Scheele in 1808

Barium

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.
Shell Electrons Orbitals
1 2 2 in 1s
2 8 2 in 2s + 6 in 2p
3 18 2 in 3s + 6 in 3p + 10 in 3d
4 18 2 in 4s + 6 in 4p + 10 in 4d
5 8 2 in 5s + 6 in 5p
6 2 2 in 6s
BariumBa Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2
137.33  u Atomic Mass
2.8  Å Atomic Radius
2170  K Boiling Point
2.15  Å Covalent Radius
3.51  g/cm³ Density
13.95 Electron Affinity
0.89 Electronegativity
5.21  eV First Ionization Energy
1002.15  K Melting Point
6 Number of Shells
2 Electron Valency
56 Atomic Number
2, 8, 18, 18, 8, 2 Electron Shell Occupations
0.2  J/(g K) Specific Heat