Q21 of 400 Page 168

What is an ionic bond? What type of bond is present in oxygen molecule?

An ionic bond is formed by the attraction of oppositely charged atoms or groups of atoms. When an atom (or group of atoms) gains or loses one or more electrons, it forms an ion. Ions have either a net positive or net negative charge. Positively charged ions are attracted to the negatively charged 'cathode' in an electric field and are called cations. Anions are negatively charged ions named as a result of their attraction to the positive 'anode' in an electric field.

Every ionic chemical bond is made up of at least one cation and one anion.


Double bond is present in oxygen.



More from this chapter

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20 Fill in the blanks in the following sentences:

(i) Two atoms of the same element combine to form a molecule. The bond between them is known as .......... bond.


(ii) Two chlorine atoms combine to form a molecule. The bond between them is known as ..........


(iii) In forming oxygen molecule, .......... electrons are shared by each atom of oxygen.


(iv) In forming N2 molecule, .......... electrons are shared by each atom of nitrogen.


(v) The number of single covalent bonds in C2H2 molecule are ...............


(vi) Melting points and boiling points of ionic compounds are generally ........than those of covalent compounds.

 21 What is a covalent bond? What type of bond exists in (i) CCl4, and (ii) CaCl2? 22 What is an ion? Explain with examples. 21 What is the nature of charge on (i) a cation, and (ii) an anion?