Chapter 6, Problem 48A

Interpretation Introduction

Interpretation:

The property of lithium having a larger value than the property of potassium is to be identified.

Concept Introduction :

The first ionization energy is the energy needed for the removal of the outermost electron from the neutral gaseous atom. An atom's tendency to attract the bonding electrons into a covalent bond is known as electronegativity.

Answer to Problem 48A

Options (a) and (c)

Explanation of Solution

The electronegativity and first ionization enthalpy decrease down the group and increase across the period. Lithium and potassium are present in the same group (group 1). Lithium is present in period 2 while potassium is present in period 4. So, potassium is present below lithium.

Thus, the first ionization energy and electronegativity of lithium will have a larger value than potassium.

Conclusion

Options (b) and (d) are incorrect because atomic and ionic sizes increase down the group.