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  • (a) How is the valency of an element determined if its electronic configuration is known ? Determine the valency of an element of atomic no. 9. (b) Given below are some elements of the Modern Periodic Table. Atomic numbers of the elements are gi

(a) How is the valency of an element determined if its electronic configuration is known ? Determine the valency of an element of atomic no. 9.
(b) Given below are some elements of the Modern Periodic Table. Atomic numbers of the elements are given in parentheses : A(4), B(9), C(14), D(19), E(20)
(i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell.
(ii) Which two elements belong to the same group ? Give reasons for your answer.
(iii) Which one of the above elements belonging to the fourth period has bigger atomic radius and why ?

 

 

 

 
 
 
 
 

Answers (1)

An element's valency is determined by the number of electrons in its outer shell. Hence, the number of valence electrons obtained from the electronic configuration of the element gives the valency i.e. the number of electrons lost, gained or shared by the element to attain the noble gas configuration.

The valency of an element of atomic number 9 would be 1 since the number of valence electrons in its outermost shell is 7 so it needs only one electron to attain the noble gas configuration.

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Satyajeet Kumar

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