マンガン

25
Mn
7
周期
4
ブロック
d
陽子
電子
中性子
25
25
30
一般特性
原子番号
25
原子量
54.938045
質量数
55
カテゴリ
遷移元素
銀色
放射性
いいえ
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
結晶構造
体心立方格子
歴史
By the mid-18th century, Swedish chemist Carl Wilhelm Scheele had used pyrolusite to produce chlorine.

Scheele and others were aware that pyrolusite contained a new element, but they were not able to isolate it.

Johan Gottlieb Gahn was the first to isolate an impure sample of manganese metal in 1774, by reducing the dioxide with carbon.
電子殻
2, 8, 13, 2
電子配置
[Ar] 3d5 4s2
Mn
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
物理特性
固体
密度
7.44 g/㎝3
融点
1519.15 K | 1246 °C | 2274.8 °F
沸点
2334.15 K | 2061 °C | 3741.8 °F
融解熱
13.2 kJ/mol
蒸発熱
220 kJ/mol
熱容量
0.479 J/g·K
地殻中における存在比
0.11%
宇宙空間における存在比
0.0008%
Small
画像の出典: Images-of-elements
Small pieces of manganese
CAS登録番号
7439-96-5
PubChem CID Number
23930
原子特性
原子半径
127 pm
共有結合半径
139 pm
電気陰性度
1.55 (ポーリングの値)
イオン化エネルギー
7.434 eV
モル体積
7.4 ㎝3/mol
熱伝導率
0.0782 W/㎝·K
酸化数
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
用途
For over 2000 years, manganese dioxide has been used to make colorless glass.

Manganese dioxide is used as the cathode material in zinc-carbon and alkaline batteries.

Manganese also functions in the oxygen-evolving complex of photosynthetic plants.

The dioxide is also used in the preparation of oxygen and chlorine and in drying black paints.
Excess manganese, particularly inhalation of the powder, is toxic
同位体
安定同位体
55Mn
不安定同位体
44Mn, 45Mn, 46Mn, 47Mn, 48Mn, 49Mn, 50Mn, 51Mn, 52Mn, 53Mn, 54Mn, 56Mn, 57Mn, 58Mn, 59Mn, 60Mn, 61Mn, 62Mn, 63Mn, 64Mn, 65Mn, 66Mn, 67Mn, 68Mn, 69Mn