Its Elemental - The Element Tellurium Tellurium was discovered by Franz Joseph Müller von Reichenstein, a Romanian mining official, in 1782 Reichenstein was the chief inspector of all mines, smelters and saltworks in Transylvania He also had an interest in chemistry and extracted a new metal from an ore of gold , known as aurum album, which he believed was antimony
Its Elemental - The Element Thallium - Thomas Jefferson National . . . Rather than seeing the yellow spectral lines produced by tellurium, he observed a bright green line that no one had ever seen before He named the new element that was producing the green line thallium, after the greek word for 'green twig', thallos
Its Elemental - The Element Selenium Originally believing the material was tellurium, Berzelius eventually realized that it was actually a previously unknown element Selenium occurs in minerals such as eucairite (CuAgSe), crooksite (CuThSe) and clausthalite (PbSe), but these minerals are too rare to use as a major source of selenium
Its Elemental - The Element Gold An attractive and highly valued metal, gold has been known for at least 5500 years Gold is sometimes found free in nature but it is usually found in conjunction with silver, quartz (SiO 2), calcite (CaCO 3), lead, tellurium, zinc or copper There is roughly 1 milligram of gold dissolved in every ton of seawater, although extracting it
Its Elemental - The Element Antimony Antimony has been known since ancient times It is sometimes found free in nature, but is usually obtained from the ores stibnite (Sb 2 S 3) and valentinite (Sb 2 O 3)
Its Elemental - The Element Iodine Iodine was discovered by the French chemist Barnard Courtois in 1811 Courtois was extracting sodium and potassium compounds from seaweed ash
The Periodic Table of Elements The Periodic Table of Elements C 6 CARBON 12 Atomic Number Chemical Symbol Atomic Weight Chemical Name = Number of Protons = Number of Electrons
The Periodic Table of Elements The Periodic Table of Elements C 6 CARBON 12 011 Atomic Number Chemical Symbol Atomic Weight Chemical Name = Solid at room temperature