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Manganese (Mn)

From Wikipedia, the free encyclopediaManganese is a chemical element with symbol Mn and atomic number 25. It is not found as a free element in nature; it is often found in combination with iron, and in many minerals. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels.

Manganese in the periodic table

SymbolMn
Atomic number25
Group7
Period4
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density7.21 g/cm3
Atomic weight54.938 u
Melting point1519 K
1245.85 °C
2274.53 °F
Boiling point2334 K
2060.85 °C
3741.53 °F

Atomic properties

Electronegativity (Pauling Scale)1.55
Electron affinity-50 kJ/mol
Oxidation states−3, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7
(depending on the oxidation state, an acidic, basic, or amphoteric oxide)
Ionization energies
1717.3 kJ/mol
2 1509 kJ/mol
3 3248 kJ/mol
4 4940 kJ/mol
5 6990 kJ/mol
6 9220 kJ/mol
7 11500 kJ/mol
8 18770 kJ/mol
9 21400 kJ/mol
10 23960 kJ/mol
11 27590 kJ/mol
12 30330 kJ/mol
13 33150 kJ/mol
14 38880 kJ/mol
15 41987 kJ/mol
16 109480 kJ/mol
17 118100 kJ/mol
18 127100 kJ/mol
19 138600 kJ/mol
20 148500 kJ/mol
21 158600 kJ/mol
22 172500 kJ/mol
23 181380 kJ/mol
24 785450 kJ/mol
25 827067 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Ar] 3d5 4s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d5 4s2
Electrons per shell2, 8, 13, 2

History

Discovered1774
Discovered byCarl Wilhelm Scheele
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