Mangan
25
Mn
Skupina
7
Perioda
4
Blok
d
Protons
Electrons
Neutrons
25
25
30
General Properties
Vrstno število
25
Atomska teža
54,938045
Mass Number
55
Kategorija
Prehodne kovine
Barva
Silver
Radioactive
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.
Electrons per shell
2, 8, 13, 2
Razporeditev elektronov
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Physical Properties
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
Abundance in Earth's crust
0,11%
Abundance in Universe
0,0008%
CAS Number
7439-96-5
PubChem CID Number
23930
Atomic Properties
Atomski polmer
127 pm
Kovalentni polmer
139 pm
Elektronegativnost
1,55 (Paulingova lestvica)
Ionization Potential
7,434 eV
Atomic Volume
7,4 cm3/mol
Toplotna prevodnost
0,0782 W/cm·K
Oksidacijska stanja
-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