Radiomu

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Radium, 88Ra
Radium
Pípè /ˈrdiəm/ (RAY-dee-əm)
Ìhànsójúsilvery white metallic
nọ́mbà ìsújọ[226]
Radium 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
Ba

Ra

Ubn
franciumradiumactinium
Nọ́mbà átọ̀mù (Z)88
Ẹgbẹ́group 2 (alkaline earth metals)
Àyèàyè 7
Àdìpọ̀Àdìpọ̀-s
Ẹ̀ka ẹ́límẹ́ntì  Alkaline earth metal
Ìtò ẹ̀lẹ́ktrọ́nù[Rn] 7s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan2, 8, 18, 32, 18, 8, 2
Àwọn ohun ìní ara
Ìfarahàn at STPsolid
Ìgbà ìyọ́973 K ​(700 °C, ​1292 °F)
Ígbà ìhó2010 K ​(1737 °C, ​3159 °F)
Kíki (near r.t.)5.5 g/cm3
Heat of fusion8.5 kJ/mol
Heat of 113 kJ/mol
 pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 819 906 1037 1209 1446 1799
Atomic properties
Oxidation states+2 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
ElectronegativityPauling scale: 0.9
Covalent radius221±2 pm
Van der Waals radius283 pm
Color lines in a spectral range
Spectral lines of radium
Other properties
Natural occurrencefrom decay
Crystal structure ​(bcc)
Body-centered cubic crystal structure for radium
Thermal conductivity18.6 W/(m·K)
Electrical resistivity1 µ Ω·m (at 20 °C)
Magnetic orderingnonmagnetic
CAS Number7440-14-4
Main isotopes of radium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
223Ra trace 11.43 d alpha 5.99 219Rn
224Ra trace 3.6319 d alpha 5.789 220Rn
226Ra ~100% 1602 y alpha 4.871 222Rn
228Ra trace 5.75 y beta 0.046 228Ac
Àdàkọ:Category-inline
| references

Rédíọ́mù (pípè /ˈradiəmu/, RAY-dee-əm) jẹ́ ìpilẹ̀ṣẹ̀ kẹ́míkà tó ní àmì-ìdímọ̀ Ra àti nọ́ḿbà átọ̀mù 88.


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