What is periodic table
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Periodic table is a table arrangements of elements based on their atomic number. It gives all information about the elements.
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Periodic table of elements is an organized display of the chemical elements. It arranged in order to increasing atomic number. Grouped according to similiarties in chemical properties. Grouped according to similiarties in electron configurations.
Early Attempts at creating a periodic table
Antoine Lavoisier (1789)
Elementary Treatise of Chemistry in 1789.
First modern chemical textbook.
John Dobereiner (1829): triads
It arranged elements with similiar properties into groups.
Triad Examples: Alkaline earth metals
Ca (40 amu)
Sr (88 amu)
Ba (137 amu)
Halogens
Cl (35.5 amu)
Br (80 amu)
l (127 amu)
Alkali metals
Li (7 amu)
Na (23 amu)
K (39 amu)
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