Periodic Table:

Element 56 - Barium / Barium

(Latin / English)

Mass Number

Atomic Mass

% Abundance

Nuclear Spin

130

129.9063

0.106

0

132

131.9050

0.101

0

133 *

132.9060

0

1/2+

134

133.9045

2.417

0

135

134.9057

6.592

3/2+

136

135.9046

7.854

0

137

136.9058

11.230

3/2+

138

137.9052

71.700

0

140 *

139.9016

0

0

(* = unstable isotope)

Electron Configuration:

[Xe] 6s2

Relative Atomic Mass:

137.33

State (25°C, 1 atm):

solid, metal

Density:

3594 kg/m3

Melting Temperature:

1002 K

Boiling Temperature:

1910 K

© W. Bauer, 1999