Barium

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Barium
56Ba
Sr

Ba

Ra
caesiumbariumlanthanum
Ìhànsójú
silvery gray
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà barium, Ba, 56
Ẹ̀ka ẹ́límẹ̀nti alkaline earth metals
Ẹgbẹ́, àsìkò, àdìpò 26, s
Ìwúwo átọ́mù 137.33
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 6s2
2, 8, 18, 18, 8, 2
Physical properties
Phase solid
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù barium
iso NA half-life DM DE (MeV) DP
130Ba 0.106% 130Ba is stable with 74 neutrons
132Ba 0.101% 132Ba is stable with 76 neutrons
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
· r

Barium (pípè /ˈbɛəriəm/, BAIR-ee-əm) je apilese kemika. O ni ami-idamo Ba, nomba atomu re je 56, ohun si ni apilese karun ni Adipo 2.


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