26 Fe Iron 55.845 u

Iron

周期
4
族
8
ブロック
d-ブロック
相 (STP)
Solid

Iron is the most widely used metal on Earth and the main component of steel. It is essential for oxygen transport in blood as part of hemoglobin.

外観: 灰色がかった光沢のある金属

About Iron

Iron is the most widely used of all metals and the principal ingredient of steel. This transition metal has atomic number 26 and an atomic mass of 55.845, a density of 7.87 g/cm³, and a melting point of 1811 K. Its [Ar] 3d6 4s2 configuration yields an electronegativity of 1.83 and a first ionization energy of 763 kJ/mol. Known and worked since antiquity, iron has no single discoverer. The element is also essential to biology, carrying oxygen in the blood as the metal center of hemoglobin. Combining strength with low cost, it sits in group 8, period 4, among the transition metals.

物理的特性

原子質量 55.845 u
密度 7.874 g/cm³
融点 1537.8 °C
沸点 2860.8 °C
STPにおける相 Solid
原子半径 156.0 pm

電子的特性

電気陰性度 1.83
イオン化エネルギー 762.5 eV
電子親和力 15.7 eV
価電子 8

電子配置

配置 [Ar] 3d⁶ 4s²

Electron Shell Configuration

Iron electron shell configuration Fe 2e⁻ 8e⁻ 14e⁻ 2e⁻
Electron shell structure of Iron — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 14
4 (N) 2

Position in Periodic Table

Iron position in the periodic table Fe

発見

発見者: Ancient

ブロックと周期

ブロック

s p d f

周期

1 2 3 4 5 6 7

周期表

ランタノイド アクチノイド

Fe を含む反応

Reduction of Iron(III) Oxide by Carbon Monoxide

Fe₂O₃ + 3CO → 2Fe + 3CO₂

Redox

Iron Corrosion (Rusting)

4Fe + 3O₂ + 6H₂O → 4Fe(OH)₃

Redox

Aluminum Reacting with Iron(III) Oxide (Thermite)

2Al + Fe₂O₃ → Al₂O₃ + 2Fe

Single Replacement

Carbon Reducing Iron Oxide in Blast Furnace

2Fe₂O₃ + 3C → 4Fe + 3CO₂

Single Replacement

Decomposition of Iron(II,III) Oxide (Direct Reduction)

Fe₃O₄ + 4CO → 3Fe + 4CO₂

Decomposition
21件の反応をすべて表示 →

Compounds Containing Iron

Iron(III) Oxide

Fe₂O₃

Iron(III) Chloride

FeCl₃

Iron(II) Sulfate

FeSO₄

Iron(II) Sulfide

FeS

Potassium Ferricyanide

K₃[Fe(CN)₆]

Potassium Ferrocyanide

K₄[Fe(CN)₆]

Iron(III) Sulfate

Fe₂(SO₄)₃

Lithium Iron Phosphate

LiFePO₄

Ferrocene

Fe(C₅H₅)₂

Ferrous Gluconate

C₁₂H₂₂FeO₁₄

Iron(II) Oxide

FeO

Iron(II,III) Oxide

Fe₃O₄

遷移金属 をもっと見る

21 Sc Scandium 22 Ti Titanium 23 V Vanadium 24 Cr Chromium 25 Mn Manganese 27 Co Cobalt 28 Ni Nickel 29 Cu Copper 30 Zn Zinc 39 Y Yttrium

Explore on Science FYI

AlloyFYI
Carbon Steel 1018

Iron-carbon alloy — most produced metal
AlloyFYI
Stainless Steel 304

Iron-based corrosion-resistant alloy
MineralFYI
Hematite

Primary iron ore (Fe₂O₃)
MineralFYI
Magnetite

Magnetic iron ore (Fe₃O₄)
MineralFYI
Pyrite

Iron sulfide — fool's gold

Frequently Asked Questions

What is Iron?
Iron (Fe) is a chemical element with atomic number 26. It is a solid at standard temperature and pressure, classified as a 遷移金属.
What are the key properties of Iron?
Iron has an atomic mass of 55.845 u, density of 7.874 g/cm³, melting point of 1537.8°C, boiling point of 2860.8°C.
What is the electron configuration of Iron?
The electron configuration of Iron is [Ar] 3d6 4s2. It is in the d-block of the periodic table.
Who discovered Iron?
Iron was discovered by Ancient.
What is the electronegativity of Iron?
Iron has an electronegativity of 1.83 on the Pauling scale.