The History of the Periodic Table

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Presentation transcript:

The History of the Periodic Table

John Dalton (1808) Ordered 36 elements Gave each element a symbol

J.W. Dobereiner (1829) Looked at the recently discovered Bromine and observed properties half way between chlorine and iodine. Called the three elements a triad

Dmitri Mendeleev (1869 – 1871) Listed the known elements in groups based on a set of repeating properties He ordered them by atomic mass Mendeleev's table worked...he left gaps in his the table if he thought an element had not been discovered.

Lothar Meyer (1869) Published a table very much like Mendeleev’s table

Henry Moseley (1913) Determined atomic number for each element known at that time

Periodic Law When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.