Mangan
25
Mn
Skupina
7
Perioda
4
Blok
d
Protoni
Elektroni
Nevtroni
25
25
30
Splošne lastnosti
Vrstno število
25
Atomska teža
54,938045
Masno število
55
Kategorija
Prehodne kovine
Barva
Srebrna
Radioaktivno
Ne
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Elektroni po lupinah
2, 8, 13, 2
Razporeditev elektronov
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
7,44 g/cm3
Tališče
1519,15 K | 1246 °C | 2274,8 °F
Vrelišče
2334,15 K | 2061 °C | 3741,8 °F
Talilna toplota
13,2 kJ/mol
Izparilna toplota
220 kJ/mol
Toplotna kapaciteta
0,479 J/g·K
Zastopanost v Zemljini skorji
0,11%
Zastopanost v vesolju
0,0008%
CAS številka
7439-96-5
PubChem CID številka
23930
Atomske lastnosti
Atomski polmer
127 pm
Kovalentni polmer
139 pm
Elektronegativnost
1,55 (Paulingova lestvica)
Ionizacijski potencial
7,434 eV
Atomski volumen
7,4 cm3/mol
Toplotna prevodnost
0,0782 W/cm·K
Oksidacijska stanja
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Uporabe
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
Izotopi
Stabilni izotopi
55MnNestabilni izotopi
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