Iron
English: Iron

This article is about iron the metal. For the tool called iron, see ironing.
A chunk of iron

Iron is a chemical element and a metal. It is the second most common metal on Earth, and the most widely-used metal. It makes up much of the Earth's core, and is the fourth most common element in the Earth's crust.

The metal is used a lot because it is strong and cheap. Iron is the main ingredient used to make steel. Raw iron is magnetic (attracted to magnets), and its compound magnetite is permanently magnetic.

In some regions iron has been used around 1200 BCE . That event is considered the transition from bronze age to iron age .

Properties

Iron(II) oxide
Iron(II) sulfate
Iron(III) chloride

Physical properties

Iron is a grey, silvery metal. It is magnetic, though different allotropes of iron have different magnetic qualities. Iron is easily found, mined and smelted, which is why it is so useful. Pure iron is soft and very malleable

Chemical properties

Iron is reactive. It reacts with most acids like sulfuric acid. It makes ferrous sulfate when reacted with sulfuric acid. This reaction with sulfuric acid is used to clean metal.

Iron reacts with air and water to make rust. When the rust flakes off, more iron is exposed allowing more iron to rust. Eventually, the whole piece of iron is rusted away. Other metals like aluminum do not rust away. Iron can be alloyed with chromium to make stainless steel, which does not rust under most conditions.

Iron powder can react with sulfur to make iron(II) sulfide, a hard black solid. Iron also reacts with the halogens to make iron(III) halides, like iron(III) chloride. Iron reacts with the hydrohalic acids to make iron(II) halides like iron(II) chloride.

Chemical compounds

Iron makes chemical compounds with other elements. Normally the other element oxidizes iron. Sometimes two electrons are taken and sometimes three. Compounds where iron has two electrons taken are called ferrous compounds. Compounds where iron has three electrons taken are called ferric compounds. Ferrous compounds have iron in its +2 oxidation state. Ferric compounds have iron in its +3 oxidation state. Iron compounds can be black, brown, yellow, green, or purple.

Ferrous compounds are weak reducing agents. Many of them are green or blue. The most common ferrous compound is ferrous sulfate.

Ferric compounds are oxidizing agents. Many of them are brown. The most common ferric compound is ferric oxide, the same thing as rust. One reason why iron rusts is because ferric oxide is an oxidizing agent. It oxidizes iron, rusting it even under paint. That is why if there is a small scratch in the paint, the whole thing can rust.

Iron(II) compounds

Compounds in the +2 oxidation state are weak reducing agents. They are normally light colored. They react with oxygen in air. They are also known as ferrous compounds.

Mixed oxidation state

These compounds are rare; only one is common. They are found in the ground.

Iron(III) compounds

Compounds in the +3 oxidation state are normally brown. They are oxidizing agents. The are corrosive. They are also known as ferric compounds.

Other Languages
Afrikaans: Yster
Alemannisch: Eisen
አማርኛ: ብረት
Ænglisc: Īsen
العربية: حديد
aragonés: Fierro
ܐܪܡܝܐ: ܦܪܙܠܐ
armãneashti: Heru
অসমীয়া: লো
asturianu: Fierro
Avañe'ẽ: Itakandua
azərbaycanca: Dəmir
تۆرکجه: دمیر
বাংলা: লোহা
Banjar: Wasi
Bân-lâm-gú: Thih
башҡортса: Тимер
беларуская: Жалеза
беларуская (тарашкевіца)‎: Жалеза
भोजपुरी: लोहा
Bislama: Aien
български: Желязо
བོད་ཡིག: ལྕགས།
bosanski: Željezo
brezhoneg: Houarn
буряад: Түмэр
català: Ferro
Чӑвашла: Тимĕр
Cebuano: Yero
čeština: Železo
corsu: Ferru
Cymraeg: Haearn
dansk: Jern
Deutsch: Eisen
ދިވެހިބަސް: ދަގަނޑު
Diné bizaad: Béésh (Fe)
eesti: Raud
Ελληνικά: Σίδηρος
English: Iron
эрзянь: Кшни
español: Hierro
Esperanto: Fero
estremeñu: Hierru
euskara: Burdina
فارسی: آهن
Fiji Hindi: Loha
føroyskt: Jarn
français: Fer
Frysk: Izer
furlan: Fier
Gaeilge: Iarann
Gaelg: Yiarn
Gàidhlig: Iarann
galego: Ferro
贛語:
Gĩkũyũ: Iron
ગુજરાતી: લોખંડ
गोंयची कोंकणी / Gõychi Konknni: लोखण
客家語/Hak-kâ-ngî: Thiet
хальмг: Төмр
한국어:
հայերեն: Երկաթ
हिन्दी: लोहा
hrvatski: Željezo
Bahasa Hulontalo: Wuwate
Ido: Fero
Bahasa Indonesia: Besi
interlingua: Ferro
Interlingue: Ferre
íslenska: Járn
italiano: Ferro
עברית: ברזל
Jawa: Wesi
ಕನ್ನಡ: ಕಬ್ಬಿಣ
ქართული: რკინა
қазақша: Темір
kernowek: Horn
Kiswahili: Chuma
коми: Кӧрт
Kongo: Kibende
Kreyòl ayisyen: Fè (non)
kurdî: Hesin
Кыргызча: Темир
лакку: Мах
Latina: Ferrum
latviešu: Dzelzs
Lëtzebuergesch: Eisen
лезги: Ракь
lietuvių: Geležis
Ligure: Færo
Limburgs: Iezer
lingála: Ebendé
Livvinkarjala: Raudu
la .lojban.: tirse
lumbaart: Fer
magyar: Vas
मैथिली: लोहा
македонски: Железо
Malagasy: Vy
മലയാളം: ഇരുമ്പ്
Malti: Ħadid
Māori: Rino
मराठी: लोखंड
Bahasa Melayu: Besi
Mìng-dĕ̤ng-ngṳ̄: Tiék
မြန်မာဘာသာ: သံ (သတ္တု)
Nederlands: IJzer (element)
Nedersaksies: Iezer
नेपाली: फलाम
नेपाल भाषा: नँ
日本語:
Napulitano: Fierro
Nordfriisk: Stälj
Norfuk / Pitkern: Aiyen
norsk: Jern
norsk nynorsk: Jern
Nouormand:
occitan: Fèrre
ଓଡ଼ିଆ: ଲୁହା
oʻzbekcha/ўзбекча: Temir
ਪੰਜਾਬੀ: ਲੋਹਾ
پنجابی: لوہا
Papiamentu: Heru
پښتو: وسپنه
Patois: Ayan
Перем Коми: Кӧрт
Piemontèis: Fer
Plattdüütsch: Iesen
polski: Żelazo
português: Ferro
Qaraqalpaqsha: Temir
Ripoarisch: Eisen
română: Fier
Runa Simi: Khillay
русиньскый: Желїзо
русский: Железо
саха тыла: Тимир
ᱥᱟᱱᱛᱟᱲᱤ: ᱢᱮᱬᱦᱮᱫ
संस्कृतम्: अयः
sardu: Ferru
Scots: Airn
Seeltersk: Iersen
shqip: Hekuri
sicilianu: Ferru
සිංහල: යකඩ
سنڌي: لوھ
slovenčina: Železo
slovenščina: Železo
Soomaaliga: Xadiid
کوردی: ئاسن
српски / srpski: Гвожђе
srpskohrvatski / српскохрватски: Željezo
Sunda: Beusi
suomi: Rauta
svenska: Järn
Tagalog: Bakal
தமிழ்: இரும்பு
Taqbaylit: Uzzal
татарча/tatarça: Тимер
తెలుగు: ఇనుము
ไทย: เหล็ก
тоҷикӣ: Оҳан
ᏣᎳᎩ: ᏔᎷᎩᏍᎩ
Türkçe: Demir
українська: Залізо
اردو: لوہا
ئۇيغۇرچە / Uyghurche: تۆمۈر
Vahcuengh: Diet
vèneto: Fero
vepsän kel’: Raud
Tiếng Việt: Sắt
Volapük: Ferin
Võro: Raud
walon: Fier
文言:
West-Vlams: Yzer (element)
Winaray: Puthaw
吴语:
ייִדיש: אייזן
Yorùbá: Iron
粵語:
Zazaki: Asın
žemaitėška: Gelžės
中文:
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