Chromium (24Cr) is steel-gray, lustrous, hard, metallic, and takes a high polish. Its compounds are toxic. It is found as chromite ore. Siberian red lead is a chromium ore prized as a red pigment for oil paints.
Molybdenum
Molybdenum (42Mo) is available in many forms including foil, sheet, wire, insulated wire, mesh, rod, powder, nanosized activated powder, and tube.
Molybdenum is a silvery-white, hard, transition metal. Scheele discovered it in 1778. It was often confused with graphite and lead ore. Molybdenum is used in alloys, electrodes and catalysts.
The World War 2 German artillery piece called "Big Bertha" contains molybdenum as an essential component of its steel.
Tungsten
Tungsten (74W) is available in many forms including foil, powder, rod, nanosized activated powder, sheet, mesh, and wire.
Pure tungsten is a steel-gray to tin-white metal. Tungsten has the highest melting point and lowest vapour pressure of all metals, and at temperatures over 1650°C has the highest tensile strength.
The metal oxidises in air and must be protected at elevated temperatures.
It has excellent corrosion resistance and is attacked only slightly by most mineral acids.
Seaborgium
Seaborgium (106Sg) is a synthetic element that is not present in the environment at all. It has no uses. Here is a brief summary of the isolation of seaborgium. Only very small amounts of of element 106, seaborgium, have ever been made. The first samples were made through a nuclear reaction involving fusion of an isotope of californium, Cf-249, with one of oxygen, O-18.
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