Q5 of 29 Page 72

The number of period and groups in modern periodic table are:

The modern periodic table consists of 118 elements which are organised into 7 periods and 18 groups.

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3

First periodic classification of element was given by:

 4

Modern periodic table is based on which property of the elements:

 6

In periodic table, atomic size on moving top to bottom in a group will:

 7

Vander Waals radius is ______ in comparison to covalent radius: