Radium (Ra)

Symbol Ra
Atomic Number 88
Atomic Weight (226)
Group 2 (alkaline earth metals or beryllium family)
IIA (Old IUPAC), IIA (CAS)
Period 7
Block s

Planetary Bohr Model of Ra
Lewis Dot Diagram of Ra

Physical Properties

Density 5.0 g/cm3
Atomic Volume 45.2 cm3/mole
Atomic Radius 2.33 angstroms
Covalent Radius pm
Radioactive Yes

States

Melting Point 700.0 °C
Boiling Point 1140.0 °C
Heat Of Fusion 8.37 kJ/mole
Heat Of Vaporization 136.82 kJ/mole

Energy

Electronegativity 0.9 (Pauling Scale)
Electron Affinity kJ/mol
1st Ionization Energy 509 kJ/mol
Specific Heat Capacity 0.094 J g−1 K−1
Thermal Conductivity 18.6 W·m−1·K−1

Electrons and Oxidation

Oxidation States 2
Electrons Per Shell 2 8 18 32 18 8 2
Electron Configuration [Rn] 7s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s2

Translations

English Radium
Deutsch Radium
Lëtzebuergesch Radium
Nederlands Radium
Afrikaans Radium
Frysk Radium
Dansk Radium
Svenska Radium
Norsk Radium
Íslenska Radn
Føroysk Radium
Latin Radium
Français Radium
Español Radio
Catalana Radi
Occitana Radi
Português Rdio
Galego Radio
Italiano Radio
Furlan Radi
Român Radiu
Moldavian Radiu
Armãneashte Radiumu
Русский ?????
Українска ?????
Byelorussian ?????
Polska Rad
Kaszëbsczi Rd
Čech Radium
Slovenský Radium
Slovenščina Radij
Hrvatska Radij
Српски ????j??
Bosnian Radij
Македонски ??????
Български ?????
Lietuviškai Radis
Lao R?dijs
Sudovian Radijan
Cymraeg Radiwm
Gaeilge na hÉireann Raidiam
Gàidhlig na h Raidiam
Gaelg Vanninagh Raadjum
Cornish Radyum
Brezhoneg Radiom
Ελληνική ?????
Shqip Radium
Ossetian ?????
Euskera Radioa
Georgian ???????
Suomi Radium
Eesti Raadium
Magyar Rdium
Türkçe Radyum
Kazakh ?????
Uzbek ?????
Tajik Radi'
Mongolian ????
日本語 ???? [rajiumu]
中国话 ?
ไทย ???????
Vietnamese Ra?i
Bahasa Melayu Radium
العربيه ??????
Il-Malti Radjum
עברית ?????
Esperanto Radiumo

History

Discovered In
1898
Discovered By
Pierre and Marie Curie
Discovered At
France
Word Origin
From the Latin word "radius" meaning "ray"