Mangan
25
Mn
Gruppe
7
Periode
4
Blok
d
Protoner
Elektroner
Neutroner
25
25
30
Generelle Egenskaber
Atomnummer
25
Atommasse
54,938045
Masseantal
55
Kategori
Overgangsmetaller
Farve
Sølv
Radioaktiv
Nej
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Krystalstruktur
Rumcentreret Kubisk
Historie
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.
Elektroner i hver skal
2, 8, 13, 2
Elektronkonfiguration
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Fysiske Egenskaber
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
Forekomst i jordskorpen
0,11%
Forekomst i universet
0,0008%
CAS-nummer
7439-96-5
PubChem CID-nummer
23930
Atomare egenskaber
Atomradius
127 pm
Kovalent radius
139 pm
Elektronegativitet
1,55 (Paulings skala)
Ioniseringspotentiale
7,434 eV
Atomvolumen
7,4 cm3/mol
Varmeledningsevne
0,0782 W/cm·K
Oxidationstrin
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Anvendelser
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
Isotoper
Stabile isotoper
55MnUstabile isotoper
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