Mangaan
25
Mn
Groep
7
Periode
4
Blok
d
Protonen
Elektronen
Neutronen
25
25
30
Algemene Eigenschappen
Atoomnummer
25
Atomair gewicht
54,938045
Massa Getal
55
Categorie
Overgangsmetalen
Kleur
Zilver
Radioactief
Nee
Van het Latijnse woord magnes, magneet, naar magnetische eigenschappen van pyrolusiet
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 13, 2
Electronconfiguratie
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Fysieke Eigenschappen
Fase
Vast
Dichtheid
7,44 g/cm3
Smeltpunt
1519,15 K | 1246 °C | 2274,8 °F
Kookpunt
2334,15 K | 2061 °C | 3741,8 °F
Fusiewarmte
13,2 kJ/mol
Verdampingswarmte
220 kJ/mol
Specifieke Warmtecapaciteit
0,479 J/g·K
Overvloedig aanwezig in de aardkorst
0,11%
Overvloedig aanwezig in het universum
0,0008%
CAS-nummer
7439-96-5
PubChem CID nummer
23930
Atoomeigenschappen
Atoomstraal
127 pm
Covalentiestraal
139 pm
Electronegativiteit
1,55 (Pauling schaal)
Ionisatiepotentiaal
7,434 eV
Atoomvolume
7,4 cm3/mol
Thermische geleiding
0,0782 W/cm·K
Oxidatietoestanden
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Toepassingen
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
Isotopen
Stabiele isotopen
55MnInstabiele isotopen
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