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The Development of the Periodic Table
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The Development of the P.Table Open Book Paper 2004 (P.Table = Periodic Table) The development of the modern P.Table has been gradual yet extremely progressive. The main foundations of the P.Table were laid in the 19th century. The modern P.Table is based on Mendeleev's table. One of the major developments is that the noble gasses were discovered in 1895 and made the final group of the table. The table is now arranged by atomic number and hence periodicity and patterns amongst large groups of elements such as the transition metals can also be examined. Instead of using maths formulas, chemists tried to sort the elements based on their properties and behaviours. Johann Doberieiner introduced the idea of triads in the P.table, and was first to order the elements in atomic weight. John Newlands explained in 1863 that every 8th element was similar in properties, and hence was known as the Law of Octaves. Newlands...
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