Mangan
25
Mn
Gruppe
7
Periode
4
Blokk
d
Protons
Electrons
Neutrons
25
25
30
Generelle eigenskapar
Atomnummer
25
Atommasse
54,938045
Mass Number
55
Kategori
Transisjonsmetall
Farge
Silver
Radioactive
Nei
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Krystallstruktur
Body Centered Cubic
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.
Elektron per energinivå
2, 8, 13, 2
Elektronkonfigurasjon
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
7,44 g/cm3
Smeltepunkt
1519,15 K | 1246 °C | 2274,8 °F
Kokepunkt
2334,15 K | 2061 °C | 3741,8 °F
Smeltevarme
13,2 kJ/mol
Fordampingsvarme
220 kJ/mol
Spesifikk varmekapasitet
0,479 J/g·K
Abundance in Earth's crust
0,11%
Abundance in Universe
0,0008%
CAS Number
7439-96-5
PubChem CID Number
23930
Atom eigenskapar
Atomradius
127 pm
Kovalent radius
139 pm
Elektronegativitet
1,55 (Paulings skala)
Ioniseringspotensial
7,434 eV
Molart volum
7,4 cm3/mol
Termisk konduktivitet
0,0782 W/cm·K
Oksidasjonstrinn
-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.
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
55MnUnstable 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