Plantilya:Infobox barium

Barium
56Ba
Sr ↑ Ba ↓ Ra Periodic table caesium ← barium → lanthanum
Panagway
silvery gray
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	barium, Ba, 56
Paglitok	/ˈbɛəriəm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-ee-əm]]
Kategoriyang elemento	alkaline earth metals
Group, period, block	2, 6, s
Gibug-aton sa atomo	137.327
Kontorno sa elektron	[Xe] 6s2 2, 8, 18, 18, 8, 2 Electron shells of barium (2, 8, 18, 18, 8, 2)
History
Pagkadiskobre	Carl Wilhelm Scheele (1772)
First isolation	Humphry Davy (1808)
Physical properties
Phase	magahi
Density (near r.t.)	3.51 g·cm−3
Liquid density at m.p.	3.338 g·cm−3
Melting point	1000 K, 727 °C, 1341 °F
Boiling point	2170 K, 1897 °C, 3447 °F
Heat of fusion	7.12 kJ·mol−1
Heat of vaporization	140.3 kJ·mol−1
Molar heat capacity	28.07 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 911 1038 1185 1388 1686 2170
Atomic properties
Oxidation states	+2 (strongly basic oxide)
Electronegativity	0.89 (Pauling scale)
Ionization energies	1st: 502.9 kJ·mol−1
	2nd: 965.2 kJ·mol−1
	3rd: 3600 kJ·mol−1
Atomic radius	222 pm
Covalent radius	215±11 pm
Van der Waals radius	268 pm
Miscellanea
Crystal structure	body-centered cubic
Magnetic ordering	paramagnetic
Electrical resistivity	(20 °C) 332 nΩ·m
Thermal conductivity	18.4 W·m−1·K−1
Thermal expansion	(25 °C) 20.6 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 1620 m·s−1
Young's modulus	13 GPa
Shear modulus	4.9 GPa
Bulk modulus	9.6 GPa
Mohs hardness	1.25
CAS registry number	7440-39-3
Most stable isotopes
Main article: Isotopes of barium
iso NA half-life DM DE (MeV) DP 130Ba 0.106% (0.5–2.7)×1021 y εε 2.620 130Xe 132Ba 0.101% >3×1020 y β+β+ 0.846 132Xe 133Ba syn 10.51 y ε 0.517 133Cs 134Ba 2.417% 134Ba is stable with 78 neutrons 135Ba 6.592% 135Ba is stable with 79 neutrons 136Ba 7.854% 136Ba is stable with 80 neutrons 137Ba 11.23% 137Ba is stable with 81 neutrons 138Ba 71.7% 138Ba is stable with 82 neutrons