Template:Infobox radium

Radium, ₈₈Ra

File:Radium226.jpg Radium electroplated on a very small sample of copper foil and covered with polyurethane to prevent reaction with the air
Radium
Pronunciation	/ˈreɪdiəm/ ​(RAY-dee-əm)
Appearance	silvery white metallic
Mass number	[226]
Radium in the periodic table
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) francium ← radium → actinium
Atomic number (Z)	88
Group	group 2 (alkaline earth metals)
Period	period 7
Block	s-block
Electron configuration	[Rn] 7s2
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	973 K ​(700 °C, ​1292 °F) (disputed)
Boiling point	2010 K ​(1737 °C, ​3159 °F)
Density (near r.t.)	5.5 g/cm3
Heat of fusion	8.5 kJ/mol
Heat of vaporization	113 kJ/mol
Vapor 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	common: +2
Electronegativity	Pauling scale: 0.9
Ionization energies	1st: 509.3 kJ/mol 2nd: 979.0 kJ/mol
Covalent radius	221±2 pm
Van der Waals radius	283 pm
Color lines in a spectral range Spectral lines of radium
Other properties
Natural occurrence	from decay
Crystal structure	​body-centered cubic (bcc) (cF4)
Lattice constant	Body-centered cubic crystal structure for radium a = 514.8 pm (near r.t.)
Thermal conductivity	18.6 W/(m⋅K)
Electrical resistivity	1 µΩ⋅m (at 20 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-14-4
History
Discovery	Pierre and Marie Curie (1898)
First isolation	Marie Curie (1910)
Isotopes of radium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 223Ra trace 11.43 d α 219Rn 224Ra trace 3.6319 d α 220Rn 225Ra trace 14.9 d β− 225Ac α 221Rn 226Ra trace 1599 y α 222Rn 228Ra trace 5.75 y β− 228Ac

Ra · Radium
Fr ← ibox Fr	iso 88 Ra  [] IB-Ra [] IBisos []	→ Ac ibox Ac
File:Symbol category class.svg cat:Ra (0) File:Symbol category class.svg cat:Ra-isotopes (0) File:Commons-logo.svg Commons File:Wikidata-logo.svg Wikidata:Q1128 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Ra}
Main isotopes of radium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 223Ra trace 11.43 d α 219Rn 224Ra trace 3.6319 d α 220Rn 225Ra trace 14.9 d β− 225Ac α 221Rn 226Ra trace 1599 y α 222Rn 228Ra trace 5.75 y β− 228Ac

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	caption: alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

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