Q26 of 181 Page 303

How does the electropositive character of elements change on going down in a group of the periodic table.’

The electropositive character of elements increases on going down in a group of periodic table because electro positivity means how muchelectrons an element can lose. so as we move down in a group the number of shell increases and more easily the element can lose electrons.


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25

Explain why :

(i) All the elements of a group have similar chemical properties.


(ii) All the elements of a period have different chemical properties.

 25

The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

 26

State how the valency of elements various (i) in a group, and (ii) in a period, of the periodic table.

 27

What is the fundamental difference in the electronic configurations between the group 1 and group 2 elements ?