Cobalt (Co)

General Properties

Symbol Co
Atomic Number 27
Atomic Weight 58.933195
Group
9 (cobalt family)
VIIIA (IUPAC), VIII (CAS)
Solid, Ferromagnetic, Conductor, Transition Metal, Metal, Stable, Natural
Period 4
Block d

Physical Properties

Density 8.9 g/cm3
Atomic Volume 6.7 cm3/mole
Atomic Radius 1.25 angstroms
Covalent Radius 126 pm
Crust Abundance 0.003%
Crystal Structure Hexagonal
Color Gray

Energy

Electronegativity 1.9 (Pauling Scale)
Electron Affinity 63.7 kJ/mol
1st Ionization Energy 761 kJ/mol
2nd Ionization Energy 1648 kJ/mol
3rd Ionization Energy 3232 kJ/mol
4th Ionization Energy 4950 kJ/mol
5th Ionization Energy 7670 kJ/mol
6th Ionization Energy 9840 kJ/mol
7th Ionization Energy 12440 kJ/mol
8th Ionization Energy 15230 kJ/mol
9th Ionization Energy 17959 kJ/mol
10th Ionization Energy 26570 kJ/mol
11th Ionization Energy 29400 kJ/mol
12th Ionization Energy 32400 kJ/mol
13th Ionization Energy 36600 kJ/mol
14th Ionization Energy 39700 kJ/mol
15th Ionization Energy 42800 kJ/mol
16th Ionization Energy 49396 kJ/mol
17th Ionization Energy 52737 kJ/mol
18th Ionization Energy 134810 kJ/mol
19th Ionization Energy 145170 kJ/mol
20th Ionization Energy 154700 kJ/mol
21st Ionization Energy 167400 kJ/mol
22nd Ionization Energy 178100 kJ/mol
23rd Ionization Energy 189300 kJ/mol
24th Ionization Energy 204500 kJ/mol
25th Ionization Energy 214100 kJ/mol
26th Ionization Energy 920870 kJ/mol
27th Ionization Energy 966023 kJ/mol
Specific Heat Capacity 0.421 J g−1 K−1
Thermal Conductivity 100.0 W·m−1·K−1

Electrons & Oxidation

Oxidation States +2,3
Electrons Per Shell 2 8 15 2
Electron Configuration [Ar] 3d7 4s2
1s2 2s2 2p6 3s2 3p6 3d7 4s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿ 
↿ 
↿ 
4s
↿⇂
4p
 
 
 
4d
 
 
 
 
 
4f
 
 
 
 
 
 
 

Nuclear

Radioactive No

Media

Planetary Bohr Model of Cobalt (Co)
Description
Hard, ductile, lustrous bluish-gray metal. Exists in the earth's curst in cocentrations of about 25 ppm. It has remarkable magnetic properties.
Uses
Used in many hard alloys; for magnets, ceramics and special glasses. Remains hard up to 982°C. Radioactive cobalt-60 is used in cancer therapy.
Sources
Occurs in compounds with arsenic, oxygen and sulfur as in cobaltine (CoAsS) and linneite (Co3S4). Pure cobalt is obtained as a byproduct of refining nickel, copper and iron.
Pronounciation (English)
KO-bolt

Translations

Afrikaans Kobalt
Aragonese Cobalto
العربية كوبلت
Armãneashte Cobaltu
asturianu Cobaltu
azərbaycan dili Kobalt
български Кобалт
বাংলা কোবাল্ট
brezhoneg Kobalt
bosanski Kobalt
Byelorussian Кобальт
Cebuano Kobalto
čeština Kobalt, Dasík†
Chuvash Кобальт
Cymraeg Cobalt
dansk Cobalt, Kobolt
Deutsch Kobalt
Ελληνικά Κοβαλτιο
English Cobalt
esperanto Kobalto
español Cobalto
eesti Koobalt
euskara Kobaltoa
فارسی کبالت
suomi Koboltti
føroyskt Kobolt
français Cobalt
furlan Cobalt
West-Frysk Kobalt
Gaeilge Cóbalt
Gàidhlig Còbalt
galego Cobalto
ગુજરાતી કોબાલ્ટનો
Gaelg Cobalt
Hakka Chinese Kû (鈷)
עברית קובלט
हिन्दी कोबाल्ट
hrvatski Kobalt
magyar Kobalt
հայերեն Կոբալտ
Indonesia Kobalt
íslenska Kóbalt
italiano Cobalto
日本語 コバルト
ქართული კობალტი
کٲشُر Kabalt
қазақ тілі Кобальт
한국어 코발트
Kurdish Kobalt
Komi Кобальт
kernewek Cobolt
кыргызча Кобальт
Latin Cobaltum
Lëtzebuergesch Kobalt
Lombard Cubaalt
lingála Kobalti
lietuvių Kobaltas
latviešu Kobalts
Mari Кобальт
Maori Cobalt
македонски Кобалт
മലയാളം കൊബാള്‍ട്ട്
монгол Кобальт
Мокшан Кобгль
Bahasa Melayu Kobalt
Malti Kobalt, ²Kobaltu
Nahuatl Cobalto
Nederlands Kobalt
norsk Kobolt
Occitan Cobalt
ирон Кобальт
polski Kobalt
português Cobalto
Runasimi Kubaltu, ²Kuwaltu
română Cobalt
русский Кобальт
slovenčina Kobalt
slovenščina Kobalt
Samoan Kobaltimi
Samogitian Kuobalts
shqip Kobalt
српски Кобалт
Southern Sotho Khobalete
svenska Kobolt
Kiswahili Kobalti
தமிழ் கோபால்ட்
Tajik Кобалт
ไทย โคบอลต์
Türkçe Kobalt
ئۇيغۇرچە كوبالت
українська Кобальт
o‘zbek Kobalt
Tiếng Việt Coban
Võro Koobalt
中文

History

Discovered In
1735
Discovered By
Georg Brandt
Discovered At
Sweden
Word Origin
From the German word "kobald" meaning "goblin" or evil spirit