Mangan

25
Mn
Grupp
7
Period
4
Block
d
Protoner
Electrons
Neutroner
25
25
30
Generella Egenskaper
Atomnummer
25
Atommassa
54,938045
Mass Number
55
Kategori
Övergångsmetaller
Färg
Silver
Radioaktiv
Nej
From the Latin word magnes, magnet, from magnetic properties of pyrolusite
Kristallstruktur
Rymdcentrerat kubisk
Historia
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.
Elektroner per skal
2, 8, 13, 2
Elektronkonfiguration
[Ar] 3d5 4s2
Mn
Neanderthals may have used black manganese di oxide as a cosmetic 50,000 years ago
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
7,44 g/cm3
Smältpunkt
1519,15 K | 1246 °C | 2274,8 °F
Kokpunkt
2334,15 K | 2061 °C | 3741,8 °F
Smältvärme
13,2 kJ/mol
Ångbildningsvärme
220 kJ/mol
Specifik värmekapacitet
0,479 J/g·K
Abundance in Earth's crust
0,11%
Abundance in Universe
0,0008%
Small
Bildkrediter: Images-of-elements
Small pieces of manganese
CAS Number
7439-96-5
PubChem CID Number
23930
Atomära Egenskaper
Atomradie
127 pm
Kovalent radie
139 pm
Elektronegativitet
1,55 (Paulingskalan)
Jonisationspotential
7,434 eV
Molvolym
7,4 cm3/mol
Värmeledningsförmåga
0,0782 W/cm·K
Oxidationstillstånd
-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.
Excess manganese, particularly inhalation of the powder, is toxic
Isotoper
Stabila isotoper
55Mn
Instabila isotoper
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