Question

Why does the density of halogens increase on moving down the group?

Answer 1

1. The density of halogens increases as we move down the group because the size of halogen atoms increases.
2. With larger atomic size, the van der Waals forces between molecules become stronger.
3. Stronger intermolecular forces make the molecules come closer, increasing their state of agglomeration.
4. Due to closer packing and increased molecular mass, the overall density of halogens increases down the group.

Thus, the increase in atomic size and stronger intermolecular forces cause the density to increase from fluorine to iodine.