Presentation on theme: "Lyndon Vistan. ATOMIC NUMBER:ATOMIC MASS: The origin of the name manganese comes from the ancient city of magnesia or what is now known as present."— Presentation transcript:
ATOMIC NUMBER:ATOMIC MASS:
The origin of the name manganese comes from the ancient city of magnesia or what is now known as present day Greece. The element maganese was originally seperated by gender, The male (magnes) attracted iron, and was the iron ore we now know as lodestone or magnetite. On the other hand The female (magnes) ore did not attract iron, but was used to decolorize glass. This feminine magnes was later called magnesia, now known as pyrolusite or manganese dioxide.
General Properties of Manganese Electronegativity according to Pauling1.5 Density7.43 g.cm -3 at 20°C Melting point1247 °C Boiling point2061 °C Ionic Radius 0.08 nm (+2) ; 0.046 nm (+7 - 1.05 V ( Mn 2+ / Mn ) Energy of first and second ionisation 716 kJ.mol -1 1489 kJ.mol -1 Electronic shell[ Ar ] 3d 5 4s 2 Vanderwaals radius0.126 nm
Manganese is a pinkish-gray active element that was discovered by Johan Gahn in 1774. manganese is a hard metal and is very brittle. It is hard to melt but is easily oxidized and can burn into oxygen when it is in the form of a powder. When manganese is alloyed with other metals such as aluminum, copper, and antimony, it ends up being magnetic. Facts from: http://www.lenntech.com/periodic/elements/mn.htmhttp://www.lenntech.com/periodic/elements/mn.htm Manganese is essential to iron and steel production. At present steel making accounts 85% to 90% of the total demand, most of the total demand. Manganese is a key component of low-cost stainless steel formulations and certain widely used alumimum alloys. Manganese dioxide is also used as a catalyst. Manganese is used to decolorize glass and make violet coloured glass. Potassium permanganate is a potent oxidizer and used as a disinfectant. Other compound that find application are Manganese oxide (MnO) and manganese carbonate (MnCO 3 ): the first goes into fertilizers and ceramics, the second is the starting material for making other manganese compounds. Facts that interest me: present steel making accounts 85% to 90% of the total demand Manganese is used to decolorize glass and make violet colored glass. MnO (a compound found in manganese) is used in fertilizers and ceramics. MnCO ( also a compound found in maganese) is used in the starting material for making other manganese compounds. Manganese is one of the most abundant metals in soils. More than 25 million tons of manganese is mined every year, representing 5 million tons of the metal, and reserves are estimated to exceed 3 billion tons of the metal.
Manganese is a grey-white metal, resembling iron, but is harder and very brittle.