Cobalt
English: Cobalt

Sheet of cobalt metal

Cobalt (chemical symbol Co) is a chemical element. It has an atomic number of 27 and an atomic mass of about 59. It is a metal.

Properties

Cobalt(II) chloride with water
Cobalt(II) chloride without water

Cobalt is a transition metal. It is shiny and conducts electricity. It is magnetic. It is a hard metal. It is moderately reactive. Iron is more reactive and copper is less reactive. It dissolves slowly in acids. This reaction makes hydrogen and a salt of cobalt. Cobalt is normally in its +2 oxidation state as an ion. Some chemical compounds contain cobalt ions in its +4 oxidation state. Cobalt(II) chloride is one of the most common cobalt compounds. Many cobalt compounds are blue or pink. One of them is black.

Chemical compounds

Cobalt comes in two oxidation states, +2 and +3. Most soluble cobalt compounds are red. They can also be green, blue, brown, and black.

Cobalt(II) compounds
Mixed oxidation state
Cobalt(III) compounds
Other Languages
Afrikaans: Kobalt
አማርኛ: ኮባልት
العربية: كوبالت
aragonés: Cobol
armãneashti: Cobaltu
asturianu: Cobaltu
azərbaycanca: Kobalt
تۆرکجه: کوبالت
বাংলা: কোবাল্ট
Bân-lâm-gú: Cobalt
беларуская: Кобальт
беларуская (тарашкевіца)‎: Кобальт
भोजपुरी: कोबाल्ट
български: Кобалт
བོད་ཡིག: གོ་བྰལ་
bosanski: Kobalt
brezhoneg: Kobalt
català: Cobalt
Чӑвашла: Кобальт
Cebuano: Kobalto
čeština: Kobalt
corsu: Cobaltu
Cymraeg: Cobalt
dansk: Kobolt
Deutsch: Cobalt
ދިވެހިބަސް: ކޮބާލްޓް
Diné bizaad: Béésh łibáhí
eesti: Koobalt
Ελληνικά: Κοβάλτιο
English: Cobalt
эрзянь: Кобальт
español: Cobalto
Esperanto: Kobalto
euskara: Kobalto
فارسی: کبالت
Fiji Hindi: Cobalt
français: Cobalt
furlan: Cobalt
Gaeilge: Cóbalt
Gaelg: Cobalt
Gàidhlig: Còbalt
galego: Cobalto
ગુજરાતી: કોબાલ્ટ
客家語/Hak-kâ-ngî: Cobalt
хальмг: Кобалтион
한국어: 코발트
հայերեն: Կոբալտ
Արեւմտահայերէն: Կոբաղդ
हिन्दी: कोबाल्ट
hrvatski: Kobalt
Ido: Kobalto
Bahasa Indonesia: Kobalt
interlingua: Cobalt
íslenska: Kóbolt
italiano: Cobalto
עברית: קובלט
Jawa: Kobalt
Kabɩyɛ: Kobalti
ಕನ್ನಡ: ಕೋಬಾಲ್ಟ್
ქართული: კობალტი
қазақша: Кобальт
Kiswahili: Kobalti
коми: Кобальт
kurdî: Kobalt
Кыргызча: Кобальт
кырык мары: Кобальт
Latina: Cobaltum
latviešu: Kobalts
Lëtzebuergesch: Kobalt
lietuvių: Kobaltas
Ligure: Cobalto
Limburgs: Kobalt
Livvinkarjala: Kobal’tu
la .lojban.: ridjinme
lumbaart: Cobalto
magyar: Kobalt
македонски: Кобалт
മലയാളം: കൊബാൾട്ട്
मराठी: कोबाल्ट
Bahasa Melayu: Kobalt
Mìng-dĕ̤ng-ngṳ̄: Gū (gĭng-sṳ̆k)
монгол: Кобальт
မြန်မာဘာသာ: ကိုဘော့ (ဒြပ်စင်)
Nederlands: Kobalt
नेपाली: कोबाल्ट
नेपाल भाषा: कोबाल्ट
日本語: コバルト
Nordfriisk: Koobalt
norsk: Kobolt
norsk nynorsk: Kobolt
occitan: Cobalt
ଓଡ଼ିଆ: କୋବାଲ୍‌ଟ
oʻzbekcha/ўзбекча: Kobalt
ਪੰਜਾਬੀ: ਕੋਬਾਲਟ
पालि: कोबाल्ट
پنجابی: کوبالٹ
Piemontèis: Cobalt
Plattdüütsch: Kobalt
polski: Kobalt
português: Cobalto
română: Cobalt
Runa Simi: Kubaltu
русский: Кобальт
संस्कृतम्: कोबाल्ट
Scots: Cobaut
Seeltersk: Cobalt
shqip: Kobalti
sicilianu: Cobbaltu
සිංහල: කොබෝල්ට්
slovenčina: Kobalt
slovenščina: Kobalt
Soomaaliga: Kobalti
کوردی: کۆبالت
српски / srpski: Кобалт
srpskohrvatski / српскохрватски: Kobalt
Sunda: Kobalt
suomi: Koboltti
svenska: Kobolt
Tagalog: Kobalto
татарча/tatarça: Кобальт
తెలుగు: కోబాల్ట్
тоҷикӣ: Кобалт
Türkçe: Kobalt
українська: Кобальт
اردو: کوبالٹ
ئۇيغۇرچە / Uyghurche: كوبالت
vepsän kel’: Kobal't (himine element)
Tiếng Việt: Coban
walon: Cobalt
文言:
Winaray: Cobalto
吴语:
ייִדיש: קאבאלט
Yorùbá: Cobalt
粵語:
中文: