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Barium (Ba)
Atomic number: 56 · Category: alkaline earth metal · Group 2 · Period 6 · Phase: Solid
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.
Block: s
Molar heat: 28.07
CPK color:#00c900
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2
Configuration (semantic): [Xe] 6s2
Shells: 2, 8, 18, 18, 8, 2
Electronegativity (Pauling): 0.89
Electron affinity: 13.954
Ionization energies: 502.9, 965.2, 3600
Periodic position
Group: 2
Period: 6
xpos: 2
ypos: 6
Spectral/Bohr images
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3D Model