Baryo

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Barium
56Ba
Sr

Ba

Ra
caesiumbariumlanthanum
Appearance
silvery gray
General properties
Name, simbolo, kaiphan barium, Ba, 56
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category alkaline earth metals
Group, period, block 26, s
Standard atomic weight 137.327
Electron configuration [Xe] 6s2
2, 8, 18, 18, 8, 2
Electron shells of barium (2, 8, 18, 18, 8, 2)
History
Discovery 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
Barium has a body-centered cubic crystal structure
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
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Ang baryo (Iningles: barium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ba ug kaiphan nga atomik 56. Ang baryo mao ang puthaw.

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