Marganets
25
Mn
Guruh
7
Davr
4
Block
d
Protonlar
Elektronlar
Neytronlar
25
25
30
General Properties
Atom raqami
25
Atom massasi
54,938045
Mass Number
55
Turkum
Oʻtish metallar
Ranggi
Silver
Radioaktivlik
Yoʻq
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Crystal Structure
Body Centered Cubic
Tarix
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
Elektron konfiguratsiyasi
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Physical Properties
Phase
Qattiq modda
Zichlik
7,44 g/cm3
Erish harorati
1519,15 K | 1246 °C | 2274,8 °F
Qaynash harorati
2334,15 K | 2061 °C | 3741,8 °F
Heat of Fusion
13,2 kJ/mol
Heat of Vaporization
220 kJ/mol
Solishtirma issiqlik sigʻimi
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
Atom radiusi
127 pm
Kovalentlik radiusi
139 pm
Elektrmanfiylik
1,55 (Poling boʻyicha)
Ionization Potential
7,434 eV
Molyar hajm
7,4 cm3/mol
Issiqlik oʻtkazuvchanlik
0,0782 W/cm·K
Oksidlanish darajasi
-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
Izotoplar
Barqaror izotoplar
55MnBeqaror izotoplar
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