Manganese - Mn

Manganese
Manganese
Manganese Symbol Mn
Manganese Atomic Number 25
Manganese Atomic Mass 54.9380 g.mol-1
Discovered by Johan Gottlieb Gahn

What is Manganese?

  • Manganese, a chemical element that has a symbol Mn and atomic number 25.
  • This element is not found as a free element in nature but available in combination with iron and other minerals.
  • It is a metal that has important metal alloy uses and particularly in stainless steel.

Chemical Properties Of Manganese

Group 7 Melting point 1246°C, 2275°F, 1519 K
Period 4 Boiling point 2061°C, 3742°F, 2334 K
Block d Density (g cm−3) 7.3  
Atomic number 25 Relative atomic mass 54.938
State at 20°C Solid Key isotopes 55Mn
Electron configuration [Ar] 3d54s2 CAS number 7439-96-5
ChemSpider ID 22372 ChemSpider is a free chemical structure database

Uses Of Manganese

  • Manganese is used to produce a variety of important alloys and to deoxidize steel and desulfurize.
  • It is also used in dry cell batteries.
  • Manganese is used as a black-brown pigment in paint.
  • It is an essential trace element for living creatures.
  • It is mainly used to decolourize glass and to prepare violet coloured glass.
  • Steel contains 1% manganese to increase the strength and improve the workability.
  • Manganese steel has 13% manganese which is very strong and used for railway tracks, rifle barrels, safes and prison bars.
  • Drink cans are made from an alloy of aluminium that contains 1.5% manganese, improving the resistance to corrosion.
  • Manganese is also used as a catalyst, decolourize the glass that is coloured green by iron impurities.
  • Manganese sulfate is used to make a fungicide.

Properties Of Manganese

  • Manganese is a grey-white, hard and very brittle metal.
  • It tarnished on exposure to air and oxidized to manganese when heated.

Certain Facts About Manganese

  • Manganese is more reactive when available in pure form, and as a powder, it will burn in oxygen to react with water and dissolves in dilute acids.

Frequently asked questions

What is the charge on manganese ion?

It has 11 protons, and 10 electrons. Therefore, 11-10 = +1.

What is the colour of manganese?

Manganese is Pale pink in colour.

How manganese is removed from water?

Water softeners are used to remove magnesium and calcium hardness from water by an exchange process.

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Practise This Question

A solution of sucrose (molar mass = 342 g/mol) is prepared by dissolving 68.4 g of it per litre of the solution. What is its osmotic pressure (R = 0.082 lit. atm.k-1mol-1) at 273 K?

 

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