Mangan

25
Mn
Gruppe
7
Periode
4
Blok
d
Protons
Electrons
Neutrons
25
25
30
General Properties
Atomnummer
25
Atommasse
54,938045
Mass Number
55
Kategori
Overgangsmetaller
Farve
Silver
Radioactive
Nej
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Krystalstruktur
Rumcentreret Kubisk
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.
Elektroner i hver skal
2, 8, 13, 2
Elektronkonfiguration
[Ar] 3d5 4s2
Mn
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Physical Properties
Tilstandsform
Fast stof
Massefylde
7,44 g/cm3
Smeltepunkt
1519,15 K | 1246 °C | 2274,8 °F
Kogepunkt
2334,15 K | 2061 °C | 3741,8 °F
Smeltevarme
13,2 kJ/mol
Fordampningsvarme
220 kJ/mol
Varmefylde
0,479 J/g·K
Abundance in Earth's crust
0,11%
Abundance in Universe
0,0008%
Small
Billede akkrediteringer: Images-of-elements
Small pieces of manganese
CAS Number
7439-96-5
PubChem CID Number
23930
Atomic Properties
Atomradius
127 pm
Kovalent radius
139 pm
Elektronegativitet
1,55 (Paulings skala)
Ionization Potential
7,434 eV
Atomic Volume
7,4 cm3/mol
Varmeledningsevne
0,0782 W/cm·K
Oxidationstrin
-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
Isotoper
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