Q30 of 181 Page 303

How does the atomic size vary on going down from top to bottom in a group of the periodic table ? why does it change this way ?

As we move top to bottom in the group a new shell is added in every element so the atomic size of the element increases.


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What is the main characteristic of the last elements in the periods of the periodic table ? What is the general name of such elements ?

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What is the number of elements in : (a) 1st period and (b) 3rd period, of the modern periodic table ?

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How does the tendency to lose electrons change as we go down in group 1 of the periodic table ? Why does it change this way ?