NCERT & CBSE Class 11 Chemistry MODERN PERIODIC TABLE

Class 11 chemistry classes : Modern periodic law(given by Mosley) states that there is a periodic repetition of properties of the elements isarranged in order of their increasing atomic numbers. This law isthe basis of formulation of the modern periodic table of elements. Many other chemists also arranged different elements in order of increasing atomic numbers. This periodic table is also known as a Long or Extended form of Periodic Table.

The present form of a periodic table which is widely used across the globe is the long form of the periodic table.In this form of a periodic table, the horizontal rows are called periods and the vertical columns are known as the groups.

The repetition of properties of elements results from alike outer electronic configuration after certain regular intervals. The elements of group IA are alkali metals which have the similar outer electronic configuration, i.e. ns1 where n refers to the number of outermost shells (principal quantum number).

Learn about Long Form of Periodic Table

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