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Group 7 (Oxidising ability (A halogen is a strong oxidising agent will…
Group 7
Oxidising ability
A halogen is a strong oxidising agent will displace a halogen that has a lower oxidising power from one of its compounds
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Trends
As you go down the group reactivity decreases because there are more shells and shielding increases.
As you go down group 7 electronegativity decreases because atomic radii increases due to a higher number of shells. Nucleus is less able to attract bond pair of electrons
As you go dwon group 7 melting point and boiling point increases because molecules become larger. As more electrons have more temporary forces between the molecules. As intermolecular forces get larger more energy is needed to break to forces of attraction
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Testing for halide ions
Bromide- silver halide precipitate is white/ cream, Dissolves in conc NH3 solution
Iodide- silver halide precipitate is yellow, Doesn't dissolve in either conc and dilute NH3 solution
Chloride: silver halide precipitate is white, Dissolves in dilute NH3 solution
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