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Evolution and development of the periodic table: First efforts to classify elements came in the publication 'Traité Elémentaire de Chimie' (Treatise on the Chemical Elements), published in 1789 by Antoine Lavoisier3. The 33 known Elements were separated as gases, metals, non-metals and earths. In the 19th century elemental discovery led to further efforts, with valency being a favoured sorting method. However, Döbereiner was first to sort elements by their weight/mass. He arranged elements to fit triads of similar properties, but also mass - each middle element had a weight equal to the average of the first and third. British chemist, Newlands, in 1863 formed the 'law of octaves' - every eighth element had similar properties. Newlands table, hindered by the noble gases remaining elusive - lacked organisation with elements sharing spaces, due also to inaccurate mass measurement1. The next major effort came from Dimitri Mendeleev helped by Stanislao Canizzaro, who, in 1958...

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