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Question

(a)   Explain why :

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

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

(b)  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.


Solution

(a) (i) All the elements of a group have similar chemical properties because they have the same number of valence electrons in their outermost shell. 

(ii) All the elements of a period have different chemical properties because they have a different number of valence electrons in their atoms. 

(b) Order of atomic numbers of an element: X<Z<Y. Because as the atomic number increases in a period from left to right the size of atoms goes decreasing. 


Chemistry
Science for Tenth Class - Part II - Chemistry
Standard X

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