Question

short note on modern periodic table

Answer 1

This periodic table is also known as Long or Extended Form of the periodic table. In the Mendeleev's periodic table the subgroups A and B have been kept together giving rise to short periods. ... Features of modern periodic table: This table has 18 vertical columns called groups and 7 horizontal rows known as periods.

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Answer 2

ModernPeriodicTable​ 

✌️✔️Classification of elements resulting from an arrangement of the elements in an increasing order of their atomic numbers is the Modern Periodic Table. 

✌️✔️Properties of the elements can be predicted more accurately with the help of the modern periodic table formed on the basis of atomic numbers. The modern Periodic Table is also called the long form of the periodic table.

✌️✔️Modern Periodic Table contains Seven horizontal rows called the periods 1 to 7. 
Similarly, the eighteen vertical colomns in this table are the groups 1 to 18.

✌️✔️Apart from these seven rows , two rows are shown separately at the bottom of periodic table. These are called Lanthanides series and actinide series respectively. 

✌️✔️There are 118 boxes in the periodic table which means there are 118 places for elements in the modern periodic table. 

This is what the modern periodic table is.

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