Rhenium
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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration
Rhenium single crystal bar and 1cm 3 cube
Molybdenite
Ammonium perrhenate
The Pratt & Whitney F-100 engine uses rhenium-containing second-generation superalloys
Tungsten
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Tungsten is a chemical element; it has symbol W and atomic number 74. It is a metal found naturally on Earth almost exclusively in compounds with other elements. It was identified as a distinct elemen
Rhenium
…since then do not have stable isotopes. Rhenium is a silvery-white metal with one of the highest melting points of all elements, exceeded by only tungsten (at standard pressure carbon sublimes rather than melts, though its sublimation point is comparable to the melting points of tungsten and rhenium). It…
Wolfram evaporated crystals and 1cm 3 cube
Tungsten rod with oxidised surface
Wolframite mineral, with a scale in cm
Tungsten mining in Rwanda forms an important part of the country's economy.