26
Fe
8
周期
4
ブロック
d
陽子
電子
中性子
26
26
30
一般特性
原子番号
26
原子量
55.845
質量数
56
カテゴリ
遷移元素
灰色
放射性
いいえ
From the Latin word ferrum
結晶構造
体心立方格子
歴史
The first iron used by humans is likely to have come from meteorites.

The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BC.

The discovery of smelting around 3000 BC led to the start of the iron age around 1200 BC and the prominent use of iron for tools and weapons.
電子殻
2, 8, 14, 2
電子配置
[Ar] 3d6 4s2
Fe
The color of blood is due to the hemoglobin, an iron-containing protein
物理特性
固体
密度
7.874 g/㎝3
融点
1811.15 K | 1538 °C | 2800.4 °F
沸点
3134.15 K | 2861 °C | 5181.8 °F
融解熱
13.8 kJ/mol
蒸発熱
347 kJ/mol
熱容量
0.449 J/g·K
地殻中における存在比
6.3%
宇宙空間における存在比
0.11%
Pure
画像の出典: Wikimedia Commons (Alchemist-hp)
Pure iron chips, electrolytically refined, as well as a high purity iron cube for comparison
CAS登録番号
7439-89-6
PubChem CID Number
23925
原子特性
原子半径
126 pm
共有結合半径
132 pm
電気陰性度
1.83 (ポーリングの値)
イオン化エネルギー
7.9024 eV
モル体積
7.1 ㎝3/mol
熱伝導率
0.802 W/㎝·K
酸化数
-2, -1, 1, 2, 3, 4, 5, 6, 7, 8
用途
Iron is used to manufacture steel and other alloys important in construction and manufacturing.

Iron is a vital constituent of plant and animal life and works as an oxygen carrier in hemoglobin.

Iron oxide mixed with aluminum powder can be ignited to create a thermite reaction, used in welding and purifying ores.
Iron is considered to be non-toxic
同位体
安定同位体
54Fe, 56Fe, 57Fe, 58Fe
不安定同位体
45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 55Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe, 72Fe