Manganès
25
Mn
Grup
7
Període
4
Bloc
d
Protons
Electrons
Neutrons
25
25
30
Propietats Generals
Nombre atòmic
25
Massa atòmica
54,938045
Nombre de massa
55
Categoria
Metalls de transició
Color
Plata
Radioactiu
No
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Estructura cristal·lina
Cos cúbic centrat
Història
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.
Electrons per capa
2, 8, 13, 2
Configuració electrònica
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Propietats Físiques
Fase
Sòlid
Densitat
7,44 g/cm3
Punt de fusió
1519,15 K | 1246 °C | 2274,8 °F
Punt d'ebullició
2334,15 K | 2061 °C | 3741,8 °F
Entalpia de fusió
13,2 kJ/mol
Entalpia de vaporització
220 kJ/mol
Capacitat tèrmica específica
0,479 J/g·K
Abundància a l'escorça terrestre
0,11%
Abundància a l'univers
0,0008%
Número CAS
7439-96-5
Número CID de PubChem
23930
Propietats Atòmiques
Radi atòmic
127 pm
Radi covalent
139 pm
Electronegativitat
1,55 (Escala de Pauling)
Potencial d'ionització
7,434 eV
Volum atòmic
7,4 cm3/mol
Conductivitat tèrmica
0,0782 W/cm·K
Estats d'oxidació
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Aplicacions
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
Isòtops
Isòtops estables
55MnIsòtops inestables
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