Q24 of 181 Page 303

What happens to the metallic character of the elements as we move from left to right in a period of the periodic table ?

The metallic character of the elements decreases as we move from left to right in a period. In group 1 and 2 maximum amout of metals are placed in the modern periodic table.


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23

How do the following change on going from left to right in a period of the periodic table ?

(i) Chemical reactivity of elements


(ii) Nature of oxides of elements

 24

How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table ? Why does it vary this way ?

 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.