The Periodic Table of Elements
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56
Ba
Barium
Summary
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
Period: 6
Group: 2
Atomic Mass: 137.328 g/mol (amu)
Discovered By: Carl Wilhelm Scheele
Phase: Solid
Boiling Point: 2118 K
Melting Point: 1000 K
Type: alkaline earth metal
Density: 3.51 g/cm3
Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2
Electron Configuration (Semantic): [Xe] 6s2