Rhenium: A rare metal with the atomic number 75 with a silvery-white appearance.

Chromium oxide, or chromic oxide, Cr2O3, may be the ninth most abundant compound in the Earth’s crust .
Chromite ore can withstand high temperatures, and is used to make some refractory bricks , which are used to line furnaces and kilns.
Tantalum is used in a few medical implants, such as for example pins in bone fractures, and in plating to displace damaged skull bone.

• In bulk form and at room temperature and atmospheric pressure, the element resists alkalis, sulfuric acid, hydrochloric acid, nitric acid, and aqua regia.
• It’s the fourth most abundant element in the Earth’s crust, having a concentration of about 4.1% by mass.
• Dealing with her husband and using x rays, Ida Tacke discovered element number 75, rhenium.
• Elemental sulfur is really a bright yellow, crystalline solid at room temperature.
• Catalysts made out of rhenium are very resistant to chemical poisoning and so are used in certain forms of hydrogenation reactions.

It is within the Earth’s crust at a concentration of 1000 ppm, making it the 12th most abundant element.
Its ores include pyrolucite [manganese oxide, MnO2], rhodochrosite [manganese carbonate, MnCO3], and manganite [MnO].
In addition, manganese-rich nodules are scattered across a lot of the ocean floor, but there is absolutely no practical way of obtaining them.

Applications

A uranium atom has 92 protons and 92 electrons, which 6 are valence electrons.
Uranium is weakly radioactive because all isotopes of uranium are unstable; the half-lives of its naturally occurring isotopes range between 159,200 years and 4.5 billion years.
Its density is approximately 70% higher than that of lead and slightly lower than that of gold or tungsten.
A very hard, brittle, silvery-white transition metal of the platinum group, iridium may be the second-densest metal with a density of 22.56 g/cm3 as defined by experimental X-ray crystallography.

• is widely used in the electronics industry in switches, circuits, and gadgets .
• Ruthenium can be used in the electronics industry in a few electrical contacts and chip resistors.
• Dysprosium is a chemical element with the symbol Dy and atomic number 66.
• In 1997, the IPUAC awarded credit for the discovery of element 105 to both groups, also it was named dubnium, following the city of Dubna, where in fact the JINR is located.

The effect increases with the rhenium concentration, and therefore tungsten alloys are produced with around 27% of Re, that is the solubility limit.
Tungsten-rhenium wire was originally created in efforts to build up a wire that has been more ductile after recrystallization.
This enables the wire to meet specific performance objectives, including superior vibration resistance, improved ductility, and higher resistivity.
One application for the tungsten-rhenium alloys is X-ray sources.
The high melting point of both elements, as well as their high atomic mass, makes them stable contrary to the prolonged electron impact.

Transition Metals

For instance, of a 100-gram sample of rhenium-187, only half that amount, or 50 grams, would be left after 100,000,000 years.
The other 50 grams could have broken down and became another isotope.
The primary uses of rhenium come in alloys which are used at very high temperatures or exposed to a lot of wear.
56 years had passed since Mendeleev had published his periodic table; the periodic table was now complete, at the very least for stable elements.
Rhenium was the ultimate element discovered which had at least one stable isotope.
Rhenium was initially found by Walter Noddack, Ida Tacke, and Otto Berg in columbite and platinum ores.

Hassium is highly radioactive; probably the most stable known isotope, ²⁶⁹Hs, has a half-life of around 16 seconds.
Antimony is really a chemical element with the symbol Sb and atomic number 51.
A lustrous gray metalloid, it really is within nature mainly because the sulfide mineral stibnite.

Europium is also the softest lanthanide, as it can be dented with a fingernail and easily cut with a knife.
Europium is one of the rarest of the rare earth elements on Earth.
Oxygen is the chemical element with the symbol O and atomic no. 8 8.
It is a person in the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements and also with other compounds.
Roskill Information Services Ltd, the London-based metals and mineral research house, estimated world production of rhenium in 2007 to possess been just 50.45 metric tonnes.
And while it estimated production at some 48.69 metric tonnes in 2006, with the release of some 15 metric tonnes from stocks, around 72 metric tonnes actually entered the planet market that year.
Whatever the figures going back two years, rhenium is, in absolute terms, a very rare metal.

They share chemical properties, but palladium has the lowest melting point and may be the least dense.
Zinc is the fourth most commonly used metal, after iron, aluminum, and copper.
Its main use can be used to coat (“galvanize”) iron or steel, forming a protective layer which is preferentially oxidized rather than the iron.
Since 1982, the US one-cent piece has been made of primarily zinc (about 97.6% of a penny’s weight), surrounded by way of a thin coating of copper .
Zinc is also found in the manufacture of automotive engine parts and car bodies, electrical equipment, and in the making of brass (an alloy of 67% copper and and 33% zinc).

Niobium oxidizes in the earth’s atmosphere very slowly, hence its application in jewelry as a hypoallergenic alternative to nickel.
Calcium is really a chemical element with the symbol Ca and atomic number 20.
As an alkaline earth metal, calcium is really a reactive metal that forms a dark oxide-nitride layer when subjected to air.
Its physical and chemical properties are most much like its heavier homologs strontium and barium.
It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminum.
Rhenium is a chemical element represented by the symbol Re on the periodic table of

Just like the other metals of the platinum group, ruthenium is inert to many other chemicals.
Russian-born scientist of Baltic-German ancestry Karl Ernst Claus discovered the aspect in 1844 at Kazan State University and named ruthenium in honor of Russia .
Bohrium is a synthetic chemical element with the symbol Bh and atomic number 107.
As a synthetic element, it really is created in a laboratory but is not found in nature.