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ChemWiki: The Dynamic Chemistry E-textbook > Inorganic Chemistry > Descriptive Chemistry > p-Block Elements > Group 14: The Carbon Family > Chemistry of Germanium

Chemistry of Germanium

Atomic Number: 32
Atomic Symbol: Ge
Atomic Weight: 72.59
Atomic Radius: 122.5 pm
Series: Metalloid
Group: 14
Density: 5.353 g/cm3
Specific Heat: 0.32J/gK
Electronic Configuration: [Ar] 4s23d104p2
Melting Point: 938.25 C
Boiling Point: 2833 C
Common Oxidation States: 4,2

Germanium, categorized as a metalloid in group 14, the Carbon family, has five naturally occurring isotopes. Germanium, abundant in the Earth's crust has been said to  improve the immune system of cancer patients. It is also used in transistors, but its most important use is in fiber-optic systems and infrared optics. 

History

In Dmitri Mendeleev's report on The Periodic Law of Chemical Elements, in 1869, he predicted the existence of may unknown elements. According to the positions of the elements in the carbon family, he predicted that the element between silicon and tin would have an atomic weight of approximately 72 and named it ekasilicon.

In a mine near Freiberg, Saxony, a new mineral was found in 1885. First the mineral was called argyrodite but later when Clemens Winkler examined this mineral he discovered that it was similar to antimony. At first he wanted to name it neptunium but because this name was already taken he named it germanium in honor of his fatherland Germany.

The position of where germanium should be placed on the periodic table was under discussion during the time due to its similarities in arsenic and antimony. Due to Mendeleev's prediction of ekasilicon, germanium's place on the periodic table was confirmed because of the similar properties predicted and similar properties deduced from examining the mineral.

 

 Germanium Pic1.jpg

Characteristics

Germanium (Ge), has an atomic number of 32. It is grayish-white, lustrous, hard and has similar chemical properties to tin and silicon. Germanium is brittle and silvery-white under standard conditions. Germanium under this condition is known as α-germanium, which has a diamond cubic crystal structure. When germanium is above 120 kilobars, germanium has a different allotrope known as β-germanium. Germanium is one of the few substances like water that expands when it solidifies.

Germanium, a semiconductor, is the first metallic metal to become a superconductor in the presence of strong electromagnetic field.

Isotopes

The five naturally occurring isotopes of Germanium  have the atomic masses of 70, 72, 73, 74, and 76. Germanium 76 is slightly radioactive and is the least common. Germanium 74 is the most common isotope having the greatest natural abundance of the five. Under the condition of being bombarded with alpha particles, Germanium 72 generates stable Se 77.

Chemical Properities

At temperature 250 °C, germanium slowly oxidizes to GeO2. Germanium dissolves slowly in concentrated sulfuric acid, and is insoluble in diluted acids and alkalis. It will react violently with molten alkalis to produce [GeO3]2-. The common oxidation state that Germanium occurs in is +4 and +2. Under rare conditions, Germanium also occurs in oxidation states of +3, +1, and -4.

There are two forms of oxides of germanium, germanium dioxide (GeO2) and germanium monoxide (GeO). By roasting germanium sulfide, germanium dioxide can be obtained. As for germanium monoxide, it can be obtained by the high temperature reaction of germanium dioxide and germanium metal. Germanium dioxide has the unusual property of refractive index for light but transparency to infrared light.

Applications and Uses

Germanium is used mainly for fiber-optic systems and infrared optics. It is also used for polymerization catalysts, electronics, and as phosphors, metallurgy, and chemotherapy. Because germanium dioxide have a high index of refraction and low optical dispersion it is useful for wide-angle camera lenses. As stated before, it is an important semi-conductor so it is used in transistors.

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Last Modified
18:19, 1 Oct 2013

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