Question

6. Write short note on :-

Structure of the modern periodic table.

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Answer 1

Answer:

In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

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Answer 2

Answer:

The modern periodic law states that “Physical and Chemical properties of elements are periodic functions of their atomic number “.

In the modern periodic table, the elements are arranged in the order of their increasing atomic number. In the modern periodic table, there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results in formation of boxes.

Although it’s being used, it has some shortcomings like it doesn’t have a fixed place for Lanthanide and Actinide. It comprises elements arranged in periods and groups. Where the elements in the group have the same valence electrons and increase in number of shells by one. And in periods there is the same number of shells and the valence electrons increase by one.

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