Chapter 18, Problem 76E

Interpretation Introduction

Interpretation: The valence electron configuration of halogens and the reason for increase in boiling and melting points of halogens from ${\text{F}}_{\text{2}}$ to ${\text{I}}_{\text{2}}$ should be determined.

Concept introduction: Elements in group 17 of periodic table is said to be halogens and this group contains six elements: $\text{F, Cl, Br, I, At}$ and $\text{Ts}$ . On moving down the group the atomic size increases due to addition of new shells thus, the atomic size increases on moving from F to Ts.