6.4 The Periodic Table and the Elements. The Periodic Table and the Elements. What is the periodic table ? What information is obtained from the table ? How can elemental properties be predicted based on the PT ?.
In 1869 Mendeleev and Lothar Meyer (Germany) published nearly identical classification schemes for elements known to date.
The periodic table is based on the similarity of properties and reactivity'sexhibited by certain elements.
Later, Henri Moseley ( England,1887-1915) established that each elements has a unique atomic number, which is how the current periodic table is organized.Dmitri Mendeleev (1869)
Many of his predictions came true, such as the existence of “eka-aluminum” which we know as gallium.
By looking specifically for this missing “eka-aluminum”, chemists were able to discover gallium.
His predictions were quite close to the actual values of the various properties he quoted, such as mass, density, ionic formula, and others.
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