Template:Infobox radium

Radium, ₈₈Ra

Radium
Pronunciation	/ˈreɪdiəm/ ​(RAY-dee-əm)
Appearance	sillery white metallic
Mass number	[226]
Radium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Gowd Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Ba ↑ Ra ↓ (Ubn) francium ← radium → actinium
Atomic nummer (Z)	88
Group	group 2 (alkaline yird metals)
Period	period 7
Block	s-block
Element category	Alkaline yird metal
Electron confeeguration	[Rn] 7s2
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Pheesical properties
Phase at STP	solit
Meltin pynt	1233 K ​(960 °C, ​1760 °F) (disputed)
Bylin pynt	2010 K ​(1737 °C, ​3159 °F)
Density (near r.t.)	5.5 g/cm3
Heat o fusion	8.5 kJ/mol
Heat o vapourisation	113 kJ/mol
Vapour pressur 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 strangly basic expectit
Electronegativity	Pauling scale: 0.9
Ionisation energies	1st: 509.3 kJ/mol 2nd: 979.0 kJ/mol
Covalent radius	221±2 pm
Van der Waals radius	283 pm
Colour lines in a spectral range Spectral lines o radium
Ither properties
Creestal structur	​body-centred cubic Body-centred cubic creestal structur for radium
Thermal conductivity	18.6 W/(m·K)
Electrical resistivity	1 µΩ·m (at 20 °C)
Magnetic orderin	nonmagnetic
CAS Nummer	7440-14-4
History
Diskivery	Pierre Curie an Marie Curie (1898)
First isolation	Marie Curie (1910)
Main isotopes o radium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 223Ra trace 11.43 d α 219Rn 224Ra trace 3.6319 d α 220Rn 225Ra trace 14.9 d β− 225Ac 226Ra trace 1600 y α 222Rn 228Ra trace 5.75 y β− 228Ac

style="text-align:left"| data m.p. cat
	in	calc from C	diff	report	ref
C	960	—	—
K	1233	1230	3
F	1760	1760	0
WD	!
input	C: 960, K: 1233, F: 1760
comment	(disputed)

style="text-align:left"| data b.p. cat
	in	calc from C	diff	report	ref
C	1737	—	—
K	2010	2010	0
F	3159	3159	0
WD	!
input	C: 1737, K: 2010, F: 3159
comment

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