page_title: Iron(II)
hierarchical_section_title: Iron(II)
caption_attribution_description: English: This is iron(II) chloride tetrahydrate. The brown colour comes from oxidation processes with air-oxygen. It gets rapidly brown under normal air conditions. So this is a slight moist product direct after production too get the nice green colour. 中文: 这是四水合氯化亚铁。棕色来自空气中的氧对它的氧化。它在常规大气状况下很快变成棕色。所以在制备得到漂亮的绿色之后有一些潮湿。
context_page_description: In chemistry, iron(II) refers to the element iron in its +2 oxidation state. In ionic compounds, such an atom may occur as a separate cation denoted by Fe²⁺.
  The adjective ferrous or the prefix ferro- is often used to specify such compounds — as in "ferrous chloride" for iron(II) chloride, FeCl
  2. The adjective "ferric" is used instead for iron(III) salts, containing the cation or Fe³⁺. The word ferrous is derived from the Latin word ferrum for iron.
  Iron(II) atoms may also occur as coordination complexes, such as the polymer iron(II) oxalate dihydrate, [Fe
  2]n or [Fe²⁺][C
  2O2−
  4][H
  2O]
  2n; and organometallic compounds, such as the neutral molecule ferrocene, Fe
  2 or [Fe²⁺][C
  5H−
  5]
  2.
  Iron is almost always encountered in the oxidation states 0, +2, or +3. Solid iron(II) salts are relatively stable in air, but in the presence of air and water they tend to oxidize to iron(III) salts that include hydroxide or oxide anions.
context_section_description: In chemistry, iron(II) refers to the element iron in its +2 oxidation state. In ionic compounds (salts), such an atom may occur as a separate cation (positive ion) denoted by Fe²⁺.
  The adjective ferrous or the prefix ferro- is often used to specify such compounds — as in "ferrous chloride" for iron(II) chloride, FeCl
  2.  The adjective "ferric" is used instead for iron(III) salts, containing the cation or Fe³⁺.  The word ferrous is derived from the Latin word ferrum for iron.
  Iron(II) atoms may also occur as coordination complexes, such as the polymer iron(II) oxalate dihydrate, [Fe(C
  2O
  4)(H
  2O)
  2]n or [Fe²⁺][C
  2O2−
  4][H
  2O]
  2n; and organometallic compounds, such as the neutral molecule ferrocene, Fe(C
  2H
  5)
  2 or [Fe²⁺][C
  5H−
  5]
  2.
  Iron is almost always encountered in the oxidation states 0 (as in the metal), +2, or +3.  Solid iron(II) salts are relatively stable in air, but in the presence of air and water they tend to oxidize to iron(III) salts that include hydroxide (HO⁻) or oxide (O²⁻) anions.
caption: Iron(II) chloride tetrahydrate, FeCl
  2·4H2O.
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