The Periodic Table of Elements

The Periodic Table of Elements

Chemistry 43

November 27, 2012

Group Members:
Riche Deleveaux
Zhizell McKenzie
Alia Gay

History
The history of the monthly submit reflects over a century of growth in the understanding of chemical properties, and culminates with the publication of the first periodic table by Dmitri Mendeleev in 1869. While Mendeleev built upon earlier discoveries by such scientists as Antoine-Laurent de Lavoisier and Stanislao Cannizzaro, the Russian scientist is generally given resole credit for information of the periodic table.
The table is a visual representation of the periodic law which states that certain properties of elements repeat periodically when arranged by atomic number. The table arranges elements into vertical columns (groups) and plain rows (periods) to display these 
Hennig Brand was the first person recorded to grant discovered a new element. Brand was a break dance German merchant who was trying to discover the Philosophers Stone â€" a mythical object that was supposed to turn inexpensive vile metals into gold. He experimented with distilling human urine until in 1649 he finally obtained a glowing white substance which he named phosphorus. He kept his discovery secret, until 1680 when Robert Boyle rediscovered it and it became public.



This and related discoveries raised the question of what it meaning for a substance to be an element.
In 1661 Boyle define an element as a substance that cannot be confounded down into a simpler substance by a chemical reaction. This simple definition actually served for nearly 301 years (until the development of the notion of subatomic particles), and even today is taught in foregoing chemistry classes.
In 1817, Johann Wolfgang Döbereiner began to formulate one of the soonest attempts to classify the elements. In 1828 he found that some elements create groups of three with related properties. He termed these groups triads. Some triads classified by Döbereiner are:
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