Barium

Barium
56Ba
Sr ↑ Ba ↓ Ra Tábìlì ìdásìkò caesium ← barium → lanthanum
Ìhànsójú
silvery gray
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	barium, Ba, 56
Ẹ̀ka ẹ́límẹ̀nti	alkaline earth metals
Ẹgbẹ́, àsìkò, àdìpò	2, 6, 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
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

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.