Radium (Ra)

General Properties

Symbol Ra
Atomic Number 88
Atomic Weight (226)
Group
2 (alkaline earth metals or beryllium family)
IIA (IUPAC), IIA (CAS)
Solid, Conductor, Alkaline Earth Metal, Metal, Radioactive, Natural
Period 7
Block s

Physical Properties

Density 5.0 g/cm3
Atomic Volume 45.2 cm3/mole
Atomic Radius 2.33 angstroms
Covalent Radius --
Crust Abundance 9.9E-12%
Crystal Structure Cubic: Body centered
Color Silver

Energy

Electronegativity 0.9 (Pauling Scale)
Electron Affinity --
1st Ionization Energy 509 kJ/mol
2nd Ionization Energy 979.0 kJ/mol
Specific Heat Capacity 0.094 J g−1 K−1
Thermal Conductivity 18.6 W·m−1·K−1

Electrons & 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
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5f
 
 
 
 
 
 
 
6s
↿⇂
6p
↿⇂
↿⇂
↿⇂
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 
7s
↿⇂
7p
 
 
 
7d
 
 
 
 
 
7f
 
 
 
 
 
 
 

Nuclear

Radioactive Yes
Half Life 1.59×103
Lifetime 2.31×103y
Decay Alpha Emission

Media

Planetary Bohr Model of Radium (Ra)
Lewis Dot Diagram of Radium (Ra)
Description
Silvery-white metal. Intensely radioactive.
Uses
Used in treating cancer because of the gamma rays it gives off.
Sources
Found in uranium ores at 1 part per 3 million parts uranium.
Pronounciation (English)
RAY-di-em

Translations

Afrikaans Radium
Aragonese Radio
العربية راديوم
Armãneashte Radiumu
asturianu Radiu
azərbaycan dili Radium
български Радий
বাংলা রেডিয়াম
brezhoneg Radiom
bosanski Radij[um]
Byelorussian Радый
Cebuano Radyo
čeština Radium
Chuvash Ради
Cymraeg Radi
dansk Radium
Deutsch Radium
Ελληνικά Ραδιο
English Radium
esperanto Radiumo
español Radio
eesti Raadium
euskara Radioa
فارسی رادیم
suomi Radium
føroyskt Radium
français Radium
furlan Radi
West-Frysk Radium
Gaeilge Raidiam
Gàidhlig Raidiam
galego Radio
ગુજરાતી રેડિયમનો
Gaelg Raadjum
Hakka Chinese Luì (鐳)
עברית רדיום
हिन्दी रेडियम
hrvatski Radij
magyar Rádium
հայերեն Ռադիում
Indonesia Radium
íslenska Radín
italiano Radio
日本語 ラジウム
ქართული რადიუმი
کٲشُر Rôd
қазақ тілі Радий
한국어 라듐
Kurdish Radyûm
Komi Радий
kernewek Radyum
кыргызча Радий
Latin Radium
Lëtzebuergesch Radium
Lombard Ràdi
lingála Ladu
lietuvių Radis
latviešu Rādijs
Mari Радий
Maori Konuruke
македонски Радиум
മലയാളം റേഡിയം
монгол Ради
Мокшан Ради
Bahasa Melayu Radium
Malti Radju[m]
Nahuatl Radio
Nederlands Radium
norsk Radium
Occitan Radi
ирон Радий
polski Rad
português Rádio
Runasimi Radyu q'illay
română Radiu
русский Радий
slovenčina Radium
slovenščina Radij
Samoan Radimi
Samogitian Radis
shqip Radium
српски Радијум
Southern Sotho Radiamo
svenska Radium
Kiswahili Radi
தமிழ் ரேடியம்
Tajik Радий
ไทย เรเดียม
Türkçe Radyum
ئۇيغۇرچە رادىي
українська Радій
o‘zbek Radiy
Tiếng Việt Rađi
Võro Raadium
中文

History

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