Chapter 7.2, Problem 11PP

Interpretation Introduction

Interpretation:

The formation of ionic compound from elements of group 1 and group 15.

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 11PP

The ionic compound formed is of type

Explanation of Solution

The periodic table depicts the position of the group 1 and group 15 elements.

Figure 1

As per overall periodic trends, the atomic and ionic radii increase on going down the group.

The group 1 elements are also said to be alkali metals. It has electronic configuration of. It has one valence electron in its valence shell. These have tendency to form ionic compounds due to its low ionization energy. The outmost electron is lost easily and hence tends to form +1 charged particles or monovalent ions.

The group 15 elements are also said to be pnicogens. It has electronic configuration of. It has 5 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 1 and group 15 are formed when there is exchange of ions that results in formation of ionic compounds

Here group 1 element\ will lose one electron to become an ion with +1 charge. Group 15 element will gain 3 electrons to become ion with -3 ion. These oppositely charge ions will attract each other to form a compound as where A represents group 1 atom and B represents group 15 atom.

Conclusion

The ionic compound formed is of type