An overview about the chemical element Silver

One of the well known chemical elements is Silver. It is a white, lustrous transition element that is represented by the chemical symbol Ag which was derived from a Latin word "Argentum" which means silver. The name silver came from an old English or Anglo-Saxon word "seolfor" which also means silver. It has an atomic number of 47, atomic weight of 107.87 and atomic volume of 10.3 cc/mol. Silver is slightly harder than gold. It is also described as ductile and malleable metal with a melting point of 961.930C or 17610F, boiling point of 22.120C, specific gravity of 10.50 (200C) and valences of 1 and 2. In the periodic table of elements, Silver is part of period 5 with elements like Zirconium, Tin and Iodine and belongs to group 11 family with Copper, Gold and Roentgenium. READ MORE AT http://www.helium.com/items/1354935

An overview about the chemical element Selenium

With an atomic number of 34, atomic mass of 78.96 and represented by a chemical symbol Se, Selenium is a chemical element that is considered chemically related to sulfur and tellurium. It is a mineral that is essential to good health but required only small amount for it can be toxic if taken in large quantity. In the periodic table of elements, Selenium belongs to the Chalcogen or group 16. It is classified as non-metallic that stays solid at 2980K. READ MORE AT http://www.helium.com/items/1354947

An overview about the chemical element Ruthenium

A chemical element that is considered rare transition metal, very hard and brittle. It is silver gray in color and one of the platinum metals from group eight of the periodic table of element together with rhodium, palladium, osmium, iridium, and platinum. It is used as hardener in alloys of platinum and palladium that even only small amounts of it can increase the hardness of platinum and palladium. The corrosion resistance of titanium is increased markedly by the addition of a small amount of ruthenium. READ MORE AT http://www.helium.com/items/1354952

An overview about the chemical element Strontium

Strontium is an alkaline earth metal using a chemical symbol Sr, with atomic number of 38, atomic weight of 87.62 and atomic volume of 33.7 cc/mole. It can be described as a soft silver-white but it turns yellow when exposed to air making it a yellowish metallic element that is highly reactive chemically. Known to be a malleable metal, it was observed to have a melting point of 10420K and boiling point of 16570K. READ MORE AT http://www.helium.com/items/1354959

The most effective way to prepare for an exam

Examination days seem to be nightmares for students because it is stressful and full of anxiety. Sometimes, students find it hard to review all given scope and encounter mental blocking during the actual exam. Others were confused and failed to organize well their review schedule. READ MORE AT http://www.helium.com/items/1354962

A brief history of Chemistry

It is believed that Chemistry started since the early times of our prehistoric ancestors. It began when the ancient civilizations tried using technologies like metal extracting from their ores, pottery making and glazes, beer and wine fermentation, making pigments for cosmetics and painting, producing medicines and perfume from plant and fruit extract, making of cheese, dying cloth, glass making and production of alloys like bronze. READ details at http://www.helium.com/items/1350030

The importance of review of related literature in a research paper

In writing a research paper, the review of related literature is considered a difficult task but plays an essential part in the completion of the study. Review of related literature involves the systematic identification, location and analysis of documents containing information related to the research problem. READ MORE AT http://www.helium.com/items/1341518