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  • Based on the group valency of elements write the molecular formula of the following compounds giving justification for each : (i) Oxide of first group elements. (ii) Halide of the elements of group thirteen, and  (iii

Based on the group valency of elements write the molecular formula of the following compounds giving justification for each :

(i) Oxide of first group elements.

(ii) Halide of the elements of group thirteen, and 

(iii) Compound formed when an element, A of group 2 combines with an        element, B of group seventeen.

 

 

 

 
 
 
 
 

Answers (1)

(i)  Sodium is a group one element so its electronic configuration is 2,8,1 and       its valency is 1. Oxide has a valency of 2. So, formula for sodium oxide is       Na_{2}O.

(ii) Halide is an halogen. Group13 means we can take aluminium whose      configuration is 2,8,3 so its valency is 3 and valency of chlorine is 1. So, the      formula would be AlCl_{3}.

(iii) Element of group 2 means magnesium whose valency is 2 and element of       group17 means chlorine whose valeny is 1. So, its formula will be MgCl_{2}

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Sumit Saini

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