Question

Explain the following:
b) Fluorine and chlorine are gases at room temperature, bromine is liquid while iodine is solid.​

Answer 1

Answer:

Thus they are gases. Bromine has a large number of electrons, meaning its London dispersion forces are strong enough to have the molecules stay together in the liquid state. Iodine has even more electrons, and thus its London dispersion forces are even strong enough that the molecules organise into a solid state.