Rubidium (Rb)

General Properties

Symbol Rb
Atomic Number 37
Atomic Weight 85.4678
Group
1 (alkali metals or hydrogen family/lithium family)
IA (IUPAC), IA (CAS)
Solid, Conductor, Alkali Metal, Metal, Stable, Natural
Period 5
Block s

Physical Properties

Density 1.53 g/cm3
Atomic Volume 55.9 cm3/mole
Atomic Radius 2.48 angstroms
Covalent Radius 211 pm
Crust Abundance 0.006%
Crystal Structure Cubic: Body centered
Color Silver

Energy

Electronegativity 0.8 (Pauling Scale)
Electron Affinity 46.9 kJ/mol
1st Ionization Energy 409 kJ/mol
2nd Ionization Energy 2633 kJ/mol
3rd Ionization Energy 3860 kJ/mol
4th Ionization Energy 5080 kJ/mol
5th Ionization Energy 6850 kJ/mol
6th Ionization Energy 8140 kJ/mol
7th Ionization Energy 9570 kJ/mol
8th Ionization Energy 13120 kJ/mol
9th Ionization Energy 14500 kJ/mol
10th Ionization Energy 26740 kJ/mol
Specific Heat Capacity 0.363 J g−1 K−1
Thermal Conductivity 58.2 W·m−1·K−1

Electrons & Oxidation

Oxidation States 1
Electrons Per Shell 2 8 18 8 1
Electron Configuration [Kr] 5s1
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
 
 
 
 
 
4f
 
 
 
 
 
 
 
5s
↿ 
5p
 
 
 
5d
 
 
 
 
 
5f
 
 
 
 
 
 
 

Nuclear

Radioactive No

Media

Planetary Bohr Model of Rubidium (Rb)
Lewis Dot Diagram of Rubidium (Rb)
Description
Soft, silvery-white, highly reactive metal.
Uses
Used as a catalyst, photocells, and vacuum and cathode-ray tubes.
Sources
Occurs abundantly, but so widespread that production is limited. Usually obtained from lithium production.
Pronounciation (English)
roo-BID-i-em

Translations

Afrikaans Rubidium
Aragonese Rubidio
العربية روبيديوم
Armãneashte Rubidiumu
asturianu Rubidiu
azərbaycan dili Rubidium
български Рубидий
বাংলা রুবিডিয়াম
brezhoneg Rubidiom
bosanski Rubidij[um]
Byelorussian Рубідый
Cebuano Rubidyo
čeština Rubidium
Chuvash Рубиди
Cymraeg Rubidi
dansk Rubidium
Deutsch Rubidium
Ελληνικά Ρουβιdιο
English Rubidium
esperanto Rubidio
español Rubídio
eesti Rubiidium
euskara Rubidioa
فارسی روبیدیم
suomi Rubidium
føroyskt Rubidium
français Rubidium
furlan Rubidi
West-Frysk Rubidium
Gaeilge Rúbaidiam
Gàidhlig Rubaidiam
galego Rubidio
ગુજરાતી રૂબિડિયમનો
Gaelg Rubiddjum
Hakka Chinese Lù (銣)
עברית רובידיום
हिन्दी रुबिडियम
hrvatski Rubidij
magyar Rubídium
հայերեն Ռուբիդիում
Indonesia Rubidium
íslenska Rúbidín
italiano Rubidio
日本語 ルビジウム
ქართული რუბიდიუმი
کٲشُر Rubid
қазақ тілі Рубидий
한국어 루비듐
Kurdish Rûbîdyûm
Komi Рубидий
kernewek Rubydyum
кыргызча Рубидий
Latin Rubidium
Lëtzebuergesch Rubidium
Lombard Rübídi
lingála Libidu
lietuvių Rubidis
latviešu Rubīdijs
Mari Рубидий
Maori Rubidium
македонски Рубидиум
മലയാളം റൂബിഡിയം
монгол Рубиди
Мокшан Рубиди
Bahasa Melayu Rubidium
Malti Rubidju[m]
Nahuatl Rubidio
Nederlands Rubidium
norsk Rubidium
Occitan Rubidi
ирон Рубидий
polski Rubid
português Rubídio
Runasimi Rubidyu
română Rubidiu
русский Рубидий
slovenčina Rubidium
slovenščina Rubidij
Samoan Rubidimi
Samogitian Robėdis
shqip Rubid, ²Rubidium
српски Рубидијум
Southern Sotho Rubidiamo
svenska Rubidium
Kiswahili Rubidi
தமிழ் ருபிடியம்
Tajik Рубидий
ไทย รูบิเดียม
Türkçe Rubidyum
ئۇيغۇرچە رۇبىدىي
українська Рубідій
o‘zbek Rubidiy
Tiếng Việt Rubiđi
Võro Rubiidium
中文

History

Discovered In
1861
Discovered By
Robert Bunsen, Gustav Kirchhoff
Discovered At
Germany
Word Origin
From the Latin word "rubidius" meaning "dark red" or "deepest red"