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Chapter: 11th Chemistry : UNIT 3 : Periodic Classification of Elements

Modern Periodic Table

Modern Periodic Table
The physical and chemical properties of the elements are correlated to the arrangement of electrons in their outermost shell (valence shell).

Modern Periodic Table

 

The physical and chemical properties of the elements are correlated to the arrangement of electrons in their outermost shell (valence shell). Different elements having similar outer shell electronic configuration possess similar properties. For example, elements having one electron in their valence shell s-orbital possess similar physical and chemical properties. These elements are grouped together in the modern periodic table as first group elements.


Similarly, all the elements are arranged in the modern periodic table which contains 18 vertical columns and 7 horizontal rows. The vertical columns are called groups and the horizontal rows are called periods. Groups are numbered 1 to 18 in accordance with the IUPAC recommendation which replaces the old numbering scheme IA to VIIA, IB to VIIB and VIII.

 

Each period starts with the element having general outer electronic configuration ns1 and ends with np6. Here ‘n’ corresponds to the period number (principal quantum number). The aufbau principle and the electronic configuration of atoms provide a theoretical foundation for the modern periodic table.




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11th Chemistry : UNIT 3 : Periodic Classification of Elements : Modern Periodic Table |


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