56 Ba 137.3277

Barium

ALKALINE EARTH METAL

Phase: Solid

Discovered: Carl Wilhelm Scheele

Block: S

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.

Source: Wikipedia

Physical Properties

Atomic Mass 137.3277 u

Density 3.51 g/cm³

Melting Point 1000 K

Boiling Point 2118 K

Molar Heat 28.07 J/(mol·K)

Electron Affinity 13.954 kJ/mol

Ionization Energies

1^st: 502.9 kJ/mol

2^nd: 965.2 kJ/mol

3^rd: 3600 kJ/mol