Манган

25
Mn
Група
7
Периода
4
блок
d
Protons
Electrons
Neutrons
25
25
30
Општи Својства
Атомски број
25
Атомска тежина
54,938045
Mass Number
55
Category
Преоден метал
Color
Silver
Radioactive
Не
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Кристална структура
Body Centered Cubic
History
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.
Electrons per shell
2, 8, 13, 2
Електронска конфигурација
[Ar] 3d5 4s2
Mn
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Физички Својства
Фаза
Solid
Густина
7,44 g/cm3
Точка на топење
1519,15 K | 1246 °C | 2274,8 °F
Точка на вриење
2334,15 K | 2061 °C | 3741,8 °F
Топлина на топење
13,2 kJ/mol
Топлина на испарување
220 kJ/mol
Specific Heat Capacity
0,479 J/g·K
Abundance in Earth's crust
0,11%
Abundance in Universe
0,0008%
Small
Кредити на слика: Images-of-elements
Small pieces of manganese
CAS Number
7439-96-5
PubChem CID Number
23930
Атомски Својства
Атомски полупречник
127 pm
Ковалентен полупречник
139 pm
Електронегативност
1,55 (Полингова скала)
Ionization Potential
7,434 eV
Atomic Volume
7,4 cm3/mol
Thermal Conductivity
0,0782 W/cm·K
Oxidation States
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Applications
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
Isotopes
Stable Isotopes
55Mn
Unstable Isotopes
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