Mangan
25
Mn
Grupă
7
Perioadă
4
Bloc
d
Protoni
Electroni
Neutroni
25
25
30
Proprietăți Generale
Număr atomic
25
Masă atomică
54,938045
Numar de masa
55
Categorie
Metale de tranziție
Culoare
Argint
Radioactive
Nu
Din cuvântul latin magnes, magnet, din proprietățile magnetice a pirolusitei
Structură cristalină
Corp Centrat Cubic
Istoric
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.
Electroni pe nivelul de energie
2, 8, 13, 2
Configurație electronică
[Ar] 3d5 4s2
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Proprietăți Fizice
Fază
Solid
Densitate
7,44 g/cm3
Punct de topire
1519,15 K | 1246 °C | 2274,8 °F
Punct de fierbere
2334,15 K | 2061 °C | 3741,8 °F
Energie de fuziune
13,2 kJ/mol
Energie de evaporare
220 kJ/mol
Căldură specifică
0,479 J/g·K
Abundența în scoarța Pământului
0,11%
Abundența în Univers
0,0008%
Numarul CAS
7439-96-5
Număr CID PubChem
23930
Proprietăți Atomice
Rază atomică
127 pm
Rază de covalență
139 pm
Electronegativitate
1,55 (Scara lui Pauling)
Potențial de ionizare
7,434 eV
Volum molar
7,4 cm3/mol
Conductivitate termică
0,0782 W/cm·K
Număr de oxidare
-3, -2, -1, 1, 2, 3, 4, 5, 6, 7
Aplicații
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
Izotopi stabili
55MnIzotopi instabili
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