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Hafnium is a shiny silver-grey, corrosion-resistant transition and heavy metal of high density (13.31 g/cm3). The element is named after the Latin name of the city of Copenhagen (Hafnia) in which it was discovered. The first evidence of hafnium was found as early as 1912, but it was not discovered until 1974 as one of the last stable elements of the periodic table. Hafnium, with a content of 4.9 ppm in the continental earth crust, is not very common on earth.
Zirconium is a very corrosion-resistant metal of the titanium group An important use of zirconium is in the shells of uranium fuel elements in nuclear power plants. This zircaloy alloy consists of approx. 90% zirconium and small amounts of tin, iron, chromium, or nickel. Zirconium is also used as a material for chemical plants, especially for special parts such as valves, pumps, pipes and heat exchangers.
Rrhenium is one of the rarest elements in the Earth's crust. Discovered in 1908, rhenium was the second-last stable element to be discovered. It was named after the river Rhine in Europe. Nickel-based superalloys of rhenium are used in the combustion chambers, turbine blades, and exhaust nozzles of jet engines. These alloys contain up to 6% rhenium, making jet engine construction the largest single use for the element. The second-most important use is as a catalyst: rhenium is an excellent catalyst for hydrogenation and isomerization, and is used for example in catalytic reforming of naphtha for use in gasoline.
Elemental gallium is a soft, silvery metal however in its liquid state it becomes silvery white. Gallium does not occur as a free element in nature, but as gallium (III) compounds in trace amounts in zinc ores and in bauxite. Gallium alloys are used in thermometers as a non-toxic and environmentally friendly alternative to mercury, and can withstand higher temperatures than mercury. Since its discovery in 1875, gallium has been used to make alloys with low melting points. It is also used in semiconductors as a dopant in semiconductor substrates.
Tantalum is often used in the manufacture of high performance and very compact capacitors because it has the ability to produce an extremely thin, voltage resistant and at the same time fully protective oxide layer. It has exceptional corrosion resistance for pure metals and is only corroded by hydrofluoric acid when cold. Tantalum is also used in the aerospace and energy industries, mainly in alloys, due to its heat resistance enhancing properties. In medical technology, it is used as a radiographic contrast agent or for the manufacture of implants and bone substitutes.
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