Barium

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Barium, 56Ba
Àdàkọ:Infobox element/symbol-to-top-image/alt
Barium
Pípè /ˈbɛəriəm/ (BAIR-ee-əm)
Ìhànsójúsilvery gray
Ìwúwo átọ̀mù Ar, std(Ba)137.327(7)Àdàkọ:CIAAW2013
Barium ní orí tábìlì àyè
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Sr

Ba

Ra
caesiumbariumlanthanum
Nọ́mbà átọ̀mù (Z)56
Ẹgbẹ́group 2 (alkaline earth metals)
Àyèàyè 6
Àdìpọ̀Àdìpọ̀-s
Ẹ̀ka ẹ́límẹ́ntì  [[Àdàkọ:Infobox element/symbol-to-category]]
Ìtò ẹ̀lẹ́ktrọ́nùÀdàkọ:Infobox element/symbol-to-electron-configuration
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 18, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STPsolid
Ìgbà ìyọ́1000 K ​(727 °C, ​1341 °F)
Ígbà ìhó2170 K ​(1897 °C, ​3447 °F)
Kíki (near r.t.)3.51 g/cm3
when liquid (at m.p.)3.338 g/cm3
Heat of fusion7.12 kJ/mol
Heat of 140.3 kJ/mol
Molar heat capacity28.07 J/(mol·K)
 pressure
Atomic properties
Oxidation statesÀdàkọ:Infobox element/symbol-to-oxidation-state
ElectronegativityPauling scale: 0.89
Atomic radiusempirical: 222 pm
Covalent radius215±11 pm
Van der Waals radius268 pm
Àdàkọ:Infobox element/spectral lines
Other properties
Natural occurrenceÀdàkọ:Infobox element/symbol-to-occurrence
Crystal structureÀdàkọ:Infobox element/crystal structure
Speed of sound thin rod1620 m/s (at 20 °C)
Thermal expansion20.6 µm/(m·K) (at 25 °C)
Thermal conductivity18.4 W/(m·K)
Electrical resistivity332 n Ω·m (at 20 °C)
Magnetic orderingparamagnetic
Young's modulus13 GPa
Shear modulus4.9 GPa
Bulk modulus9.6 GPa
Mohs hardness1.25
CAS Number7440-39-3
Main isotopes of barium
[[Isotope|IsoÀdàkọ:Shytope]] [[Natural abundance|AbunÀdàkọ:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProÀdàkọ:Shyduct]]
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
Àdàkọ:Category-inline
| references

Báríọ́mù (pípè /ˈbɛəriəm/, BAIR-ee-əm) jẹ́ ìpilẹ̀ṣẹ̀ kẹ́míkà. Ó ní àmì-ìdánimọ̀ , nọ́mbà átọ́ọ́mù rẹ̀ jẹ́ mẹ́rìndínlọ́gọ́ta (56), nítorí òun ni ìpilẹ̀ṣẹ̀ karùn ún ní ipò kejì nínú kẹ́míkà atọ́ọ́mù.


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