Chapter 12.2, Problem 2RQ

Interpretation Introduction

Interpretation:

The oxygen forms $O^{2-}not{O}^{3-}.$ is to be explained.

Concept introduction:

Ionic bonds are formed when there is complete transfer of electrons from one atom to another forming the bonds.

Ionic bond is formed by atoms which have maximum tendency to loss and gain electrons and after losing their electrons if octet is completed.

Answer to Problem 2RQ

The oxygen forms $O^{2-}not{O}^{3-}$ because after gaining two electrons, octet of oxygen is completed.

Explanation of Solution

Electronic configuration of oxygen is:

  $1s^{2}2s^{2}2p^4$

Thus it requires two electrons to get noble gas configuration. That’s why it gains two electrons and forms $O^{2-}not{O}^{3-}$ .

Conclusion

Thus to achieve stability oxygen forms $O^{2-}not{O}^{3-}$