Thorium (Th)

General Properties

Symbol Th
Atomic Number 90
Atomic Weight 232.0381
Group
(Actinoids)
Solid, Conductor, Actinide, Radioactive, Natural
Period 7
Block f

Physical Properties

Density 11.7 g/cm3
Atomic Volume 19.9 cm3/mole
Atomic Radius 1.8 angstroms
Covalent Radius --
Crust Abundance 0.0006%
Crystal Structure Cubic: Face centered
Color Silver

Energy

Electronegativity 1.3 (Pauling Scale)
Electron Affinity --
1st Ionization Energy 587 kJ/mol
2e Ionization Energy 1110 kJ/mol
3e Ionization Energy 1930 kJ/mol
4e Ionization Energy 2780 kJ/mol
Specific Heat Capacity 0.113 J g−1 K−1
Thermal Conductivity 54.0 W·m−1·K−1

Electrons & Oxidation

Oxidation States 4
Electrons Per Shell 2 8 18 32 18 10 2
Electron Configuration [Rn] 6d2 7s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 6d2 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 1.406×1010
Lifetime 2.0285×1010y
Decay Alpha Emission

Media

Planetary Bohr Model of Thorium (Th)
Lewis Dot Diagram of Thorium (Th)
Description
Heavy, gray, soft, malleable, ductile, radioactive metal.
Uses
Used in making strong alloys. Also in ultraviolet photoelectric cells. It is a common ingredient in high-quality lenses. Bombarded with neutrons make uranium-233, a nuclear fuel.
Sources
Found in various minerals like monazite and thorite.
Pronounciation (English)
THOR-i-em

Translations

Afrikaans Torium
Aragonese Torio
العربية ثوريوم
Armãneashte Toriumu
asturianu Toriu
azərbaycan dili Torium
български Торий
বাংলা থোরিয়াম
brezhoneg Toriom
bosanski Thorijum, ²Torij
Byelorussian Торый
Cebuano Toryo
čeština Thorium
Chuvash Тори
Cymraeg Tori
dansk Thorium
Deutsch Thorium
Ελληνικά Θοριο
English Thorium
esperanto Torio
español Tório
eesti Toorium
euskara Torioa
فارسی توریم
suomi Torium
føroyskt Thorium
français Thorium
furlan Tori
West-Frysk Thorium
Gaeilge Tóiriam
Gàidhlig Tòiriam
galego Torio
ગુજરાતી થોરિયમનો
Gaelg Thorium
Hakka Chinese Thú (釷)
עברית תוריום
हिन्दी थोरियम
hrvatski Torij
magyar Tórium
հայերեն Թորիում
Indonesia Torium
íslenska Þórín
italiano Torio
日本語 トリウム
ქართული თორიუმი
کٲشُر Tor
қазақ тілі Торий
한국어 토륨
Kurdish Toryûm
Komi Торий
kernewek Thoryum
кыргызча Торий
Latin Thorium
Lëtzebuergesch Thorium
Lombard Tòri
lingála Tolu
lietuvių Toris
latviešu Torijs
Mari Торий
Maori Thorium
македонски Ториум
മലയാളം തോറിയം
монгол Тори
Мокшан Тори
Bahasa Melayu Torium
Malti Torju[m]
Nahuatl Torio
Nederlands Thorium
norsk Thorium
Occitan Tòri
ирон Торий
polski Tor
português Tório
Runasimi Thoryu
română Toriu
русский Торий
slovenčina Thorium
slovenščina Torij
Samoan Kabasino
Samogitian Toris
shqip Torium, ²Thoriumi
српски Торијум
Southern Sotho Toriamo
svenska Torium
Kiswahili Thori
தமிழ் தோரியம்
Tajik Торий
ไทย ทอเรียม
Türkçe Toryum
ئۇيغۇرچە تورىي
українська Торій
o‘zbek Toriy
Tiếng Việt Thori
Võro Toorium
中文

History

Discovered In
1829
Discovered By
Jöns Berzelius
Discovered At
Sweden
Word Origin
Named after "Thor", the mythological Scandinavian god of war