Манган
25
Mn
Група
7
Периода
4
Блок
d
Протони
Електрони
Неутрони
25
25
30
Општа својства
Атомски број
25
Атомска маса
54,938045
Масени број
55
Категорија
Прелазни метали
Боја
Сребрена
Радиоактиван
Не
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Кристална структура
Просторноцентрична Кубична
Историја
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.
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.
Електрони по љусци
2, 8, 13, 2
Електронска конфигурација
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Физичка својства
Стање
Чвсрто
Густина
7,44 g/cm3
Температура топљења
1519,15 K | 1246 °C | 2274,8 °F
Температура кључања
2334,15 K | 2061 °C | 3741,8 °F
Топлота топљења
13,2 kJ/mol
Топлота испаравања
220 kJ/mol
Специфична топлота
0,479 J/g·K
Заступљеност у Земљиној кори
0,11%
Заступљеност у Космосу
0,0008%
CAS број
7439-96-5
ПубЦхем ЦИД број
23930
Атомска својства
Атомски радијус
127 pm
Ковалентни радијус
139 pm
Електронегативност
1,55 (Полингова скала)
Јонизујући потенцијал
7,434 eV
Молска запремина
7,4 cm3/mol
Топлотна проводљивост
0,0782 W/cm·K
Оксидациона стања
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Примена
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.
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
Изотопи
Стабилни изотопи
55MnНестабилни изотопи
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