Electronic data		Thermal data		Steric data
Shells: 2,8,18,18,8,2 Orbitals: [Xe] 6s2 Electronegativity: 1.0, 0.9 1. Ionization potential: 5.2117 eV 2. Ionization potential: 10.004 eV 3. Ionization potential: -- eV Oxidation states: 2 Electrical conductivity: 0.030 10^6		Melting point: 725 °C Boiling point: 1897 °C Specific heat: 0.204 J/gK Heat of fusion: 7.750 kJ/mol Heat of vaporization: 142.0 kJ/mol Thermal conductivity: 0.184 W/cmK		Atomic radius: 2.78 Å Ionic radius: 1.42 Å () Covalent radius: 1.98 Å Atomic volume: 39.24 cm³/mol Density (293 K): 3.51 g/cm³ Crystal structure: Cubic: Body centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
130Ba	0.101	129.906	0	--	stable	--
131Ba	0	131	1/2	11.7d	EC,+	View
132Ba	0.097	131.905	0	--	stable	--
133Ba	0	133	1/2	10.53y	EC	View
133Bam	0	133	11/2	1.621d	IT,EC	View
134Ba	2.42	133.905	0	--	stable	--
135Ba	6.59	134.906	3/2	--	stable	--
135Bam	0	135	11/2	1.20d	IT	View
136Ba	7.81	135.905	0	--	stable	--
137Ba	11.32	137.906	3/2	--	stable	--
137Bam	0	137	11/2	2.552m	IT	View
138Ba	71.66	137.905	0	--	stable	--
139Ba	0	139	7/2	1.396h	-	View
140Ba	0	140	0	12.75d	-	View
141Ba	0	141	3/2	18.3m	-	View
142Ba	0	142	0	10.7m	-	View

Legend

Name origin:	Greek: barys (heavy or dense).
Description:	Soft, slightly malleable, silvery-white metal.
Discovered by:	Sir Humphrey Davy
Year:	1808
Place:	England
Sources:	Found in barytine (BaSO4) and witherite (BaCO3), never found in pure form due to its reactivity. Must be stored under kerosene to remain pure.
Use(s):	Barite, or barium sulfate (BaSO4), when ground is used as a filter for rubber, plastics, and resins. It is insoluable in water and so is used in X-rays of the digestive system. Barium nitrate, Ba(NO3)2, burns brilliant green and is used in fireworks