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In the third of my Elements of the Periodic Table series I take a look at lithium. Discovered by Johan Arfwedson in 1817, lithium is a soft, shiny, silver-white alkali metal and the lightest of the solid elements. The methods of lithium production, its history and the origin of its name are all Continue reading Lithium First observed by Pierre Janssen during a solar eclipse in 1868, helium is the second lightest of the chemical elements. In the second of my Elements of the Periodic Table series, the essential facts, history and uses of helium are examined, including its use as a coolant in the Large Hadron Collider (LHC) Continue reading Helium Discovered by Henry Cavendish in 1766, hydrogen is the lightest and most abundant of the chemical elements. In the first of a series of articles about the Elements of the Periodic Table, I set out to investigate the essential facts, history and uses of hydrogen. On the way I look at hydrogen’s stable Continue reading Hydrogen In the modern world, our lives are controlled by the clock to higher levels of precision than ever before. But how many of us stop to think why we divide time into such peculiar units? Why are there 60 minutes in an hour and 24 hours in a day? In this article, from earlier Continue reading Why are There 60 Minutes in an Hour? |
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Copyright © 2008-2012 Gary Wallace - All Rights Reserved |
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