Манган
25
Mn
Група
7
Период
4
Блок
d
Протони
Електрони
Неутрони
25
25
30
Главни свойства
Атомен номер
25
Атомна маса
54.938045
Масов номер
55
Категория
Преходни метали
Цвят
Сребърен
Радиоактивни
Не
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Кристална структура
Центрове центрирани кубични
История
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.
Електрон на обвивка
2, 8, 13, 2
Електронна конфигурация
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Физични свойства
Фаза
Твърди
Плътност
7.44 g/cm3
Температура на топене
1519.15 K | 1246 °C | 2274.8 °F
Температура на кипене
2334.15 K | 2061 °C | 3741.8 °F
Топлина на сливането
13.2 kJ/mol
Топлина на изпаряване
220 kJ/mol
Специфичен топлинен капацитет
0.479 J/g·K
Изобилие в земната кора
0.11%
Изобилие в вселената
0.0008%
Номер на CAS
7439-96-5
Номер на PubChem CID
23930
Атомни свойства
Атомен радиус
127 pm
Ковалентен радиус
139 pm
Електроотрицателност
1.55 (Скала на Полинг)
Йонизационен потенциал
7.434 eV
Моларен обем
7.4 cm3/mol
Топлопроводимост
0.0782 W/cm·K
Оксидационни държави
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Приложения
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