Chapter 7, Problem 108A

Interpretation Introduction

Interpretation:

The formation of an ionic bond between potassium and iodine with the help of electron-dot structure needs to be determined.

Concept introduction:

Electron-dot structures are mainly helpful when used to represent the formation of chemical bonds. While writing the electron-dot structure of an atom, dots depicting valence electrons are put on the four sides of the symbol one at a time (they can be put in any sequence) and then paired up until all are used.

Answer to Problem 108A

Ionic bond is formed between potassium and iodine by transferring one valence electron from potassium to iodine.

Explanation of Solution

Potassium is a group 1 metal and it has one valence electron while iodine is a group 17 elements and has seven valence electrons. Draw the electron dot structures depicting both elements.

In order to form a stable, neutral ionic compound, potassium gives its valance electron to iodine. Then iodine have full octet of valence electrons and $-1$ charge. And potassium has vacant valence shell and a +1 charge. Transferring of one valence electron from iodine to potassium is given below:

Conclusion

The electrostatic force that binds oppositely charged particles together in an ionic compound is referred to as an ionic bond.