2 - Inorganic Chemistry (b) Group 7 (halogens) - chlorine, bromine and iodine
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What are the colours and state at room temperature of Fluorine, Chlorine, Bromine, and Iodine?
Fluorine - Light yellow/green gas at room temp Chlorine - Green gas at room temperature Bromine - Red/Orange liquid (easily vaporises to a red/orange gas) Iodine - Grey solid (easily vaporises into a purple gas)
What are common physical properties of the halogens?
They are diatomic molecules Strong covalent bonds Weak intermolecular forces Low melting and boiling points Poor conductors of heat and electricity
How do melting and boiling points change as you go down group 7?
Melting and boiling point increases as you go down group 7.
How does reactivity change in group 7?
Elements are more reactive as you go UP the group (fluorine more reactive than Chlorine, which is more reactive than bromine, etc…)
How can displacement reactions show us the trend of reactivity in Group 7?
A more reactive halogen will displace a less reactive halogen, which shows us the order of reactivity by what displaces/reacts with what.