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Effect of thermal and electrical conductivity on halogens

Answer Text:
Effect of thermal and electrical conductivity on halogens
- Fluorine and chlorine are gases at room temperature and simply expand and increase in volume when heated.
- Bromine is a brown liquid at room temperature and evolves brown fumes when heated.
- Iodine exists as shiny dark grey solid at room
temperature and sublimes to give brown fumes when heated.
Electrical conductivity.
- All halogens are on conductors of heat and electricity.
Reason:
- Halogens are molecular and thus have neither delocalized electrons nor
free mobile ions for electrical conductivity