NO. 056Alkaline Earth

Ba

Barium

Barium is a soft metal used in medical imaging and fireworks to produce green colors.

Crystal Structure

Body-centered cubic (bcc)

Atomic Mass137.33 u

Density3.62 g/cm³

Melting Point1000 K

Boiling Point2170 K

Atomic Radius253 pm

Electronegativity0.89

Ionization Energy503 kJ/mol

Electron Affinity14 kJ/mol

Bonding TypeMetallic

Oxidation States2

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 6s2

Discovered ByHumphry Davy

Year1808

Known Isotopes

Ba-130Ba-132Ba-134Ba-135Ba-136Ba-137Ba-138