Chapter 7.1, Problem 6SSC

Interpretation Introduction

Interpretation:

The models representing the formation of positive calcium ion and negative bromide ion needs to be represented.

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. When there is sharing of electrons between the two molecules it is a covalent bond.

Answer to Problem 6SSC

The Calcium ion is formed by absorbing energy and Bromide ion is formed by releasing energy.

Explanation of Solution

The electronic configuration of Calcium is ${\text{1s}}^{\text{2}} {\text{2s}}^{\text{2}} {\text{2p}}^{\text{6}} {\text{3s}}^{\text{2}} {\text{3p}}^{\text{6}} {\text{4s}}^{\text{2}}$. It can be noted that there are 2 electrons in the last shell which can be easily removed by absorbing energy. The bonds are not very strong and can be easily removed.

Figure 1

The electronic configuration of Bromine is ${\text{1s}}^{\text{2}} {\text{2s}}^{\text{2}} {\text{2p}}^{\text{6}} {\text{3s}}^{\text{2}} {\text{3p}}^{\text{6}} {\text{4s}}^{\text{2}}3{\text{d}}^{10}{\text{4p}}^5$

It can be noted that Bromine has 7 electrons and requires one more electron to fill its octet structure. For addition of electron, it releases energy to form Bromide ion.

Figure 2

Conclusion

The Calcium ion is formed by absorbing energy and Bromide ion is formed by releasing energy.