Q31 of 400 Page 168

What is the cause of chemical bonding (or chemical combination) of atoms of elements?

The cause of chemical bonding of atoms of the elements is because atoms form chemical bonds to achieve stability by acquiring the inert gas electron configuration.

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30 Give the formulae of the compounds that would be formed by the combination of the following pairs of elements:

(a) Mg and N2


(b) Al and Cl2


(c) Li and O2


(d) K and H


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 31 What are noble gases ? What is the characteristic of the electronic configuration of noble gases? 32 (i) Write electron-dot structures for magnesium and oxygen.

(ii) Show the formation of MgO by the transfer of electrons.


(iii) What are the ions present in this compound?

 33 Draw the electron-dot structure of a hydrogen chloride molecule:

(i) Which inert gas does the H atom in HCl resemble in electron arrangement?


(ii) Which inert gas does the Cl atom in HCl resemble in electron arrangement?