Chapter 7.3, Problem 23PP

Interpretation Introduction

Interpretation:

The formation of ionic compound from elements of group 2 and group 17.

Concept introduction:

Chemical compounds are formed when the atoms, ions or molecules of two substances are attracted towards each other forming a chemical bond. This bond can be electrostatic when two oppositely charged ions are attracted towards each other and this bond is said to be ionic bond.

Answer to Problem 23PP

The ionic compound formed is of type

Explanation of Solution

The periodic table depicts the position of the group 2 and group 17 elements.

Figure 1

As per overall periodic trends, the atomic and ionic radii increase on going down the group. The group 2 elements are also said to be alkaline earth metals. It has electronic configuration of. It has two valence electron in its valence shell. The alkaline earth metals has tendency to lose two electrons and form +2 charged particles or divalent ions.

The group 17 elements are also said to be halogens. It has electronic configuration of. It has 7 valence electrons in outermost shells. It can accept electrons and become negatively charged particles.

There is transfer of electron or gain of electrons, causing the atoms to become positively charged or negatively charged. These opposing charged particles will attract one another to form ionic compound. The compounds between group 2 and group 17 are formed when there is exchange of ions resulting in formation of ionic compounds

Here group 2 element\ will lose two electron to become an ion with +2 charge. Group 17 element will gain 2 electrons to become ion with -2 ion. These oppositely charge ions will attract each other to form a compound. If A represents group 2 and B represents group 17, then two of ‘A’ will combine with one of ‘B’ to form compound.

Conclusion

The ionic compound formed is of type