Group 7 (AS)

• Down group 7 atomic radius increases.
• The most electronegative halogen is fluorine which is also the most electronegative element.
• Down group 7 melting point and boiling point increase due to Van der Waals forces increasing which require more energy to overcome.
• Chlorine is a green gas at room temperature.
• Bromine is a brown liquid at room temperature.
• Down group 7, oxidising ability decreases.
• Down group 7, electronegativity decreases.
• Down group 7, 1st ionisation energy decreases because the distance between the nucleus and outer shell increases which means less energy is needed to remove the electron.
• All halides react with concentrated sulfuric acid to give a hydrogen halide as a product.
• Not all halide ions are strong enough reducing agents that they can reduce sulfuric acid to water.