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Periodic Table of Chemical Elements |
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In 1869, the Russian Dmitri Mendeleev arranged the known chemical elements to illustrate recurring trends. This is known and used today as the Periodic Table of Chemical Elements, where each chemical element has a unique number that relates to the number of protons and electrons in the atom. It has evolved to contain much more information on each element, from its radius to its ionisation potential to the quantum mechanics of its electron configuration and much more. The periodic chart effectively is the roadmap for chemistry, physics, biology, and engineering, especially chemical engineering. The periodic chart makes it possible for us to ensure comparability in chemistry and chemical measurement. Thus it forms the foundation of metrology in chemistry. This version of the Periodic Chart is the 103-element version. The 2011 version goes up to 118 elements. Of these, only the first 94 are found in nature, and the rest are synthetic elements that have been produced artificially in particle accelerators. The National Metrology Laboratory of South Africa (NMISA) and the German National Metrology Institute (Physikalisch-Technische Bundesanstalt - PTB) have joined forces to celebrate our metrology in chemistry achievements. We trust that you will enjoy this jigsaw puzzle in support of our celebrations of World Metrology Day – Measurements in Chemistry. Please enter your details to participate in the competition - there will be a USD 100 web-voucher for the fastest periodic jigsawer. Click here to start: http://injozi.biz/wip/periodic_puzzle/ Yours in supporting measurements in Chemistry, The NMISA and PTB
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