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Halogen reactivity trend snar full#
Group 7 elements need to gain 1 electron to have a full shell.Williams, A. For stability, the atom needs to have a full outer shell. Explaining reactivity Īs we descend Group 7, the reactivity decreases. The iodide ions have lost electrons, so they have been oxidised. We can see that the bromine has gained electrons, so it has been reduced. īromine + potassium iodide → iodine + potassium bromideĪs an ionic equation (ignoring the ‘spectator’ potassium ions): When we consider one of the displacement reactions, we can see which element is being oxidised and which is being reduced. Halogen displacement reactions are redox reactions because the halogens gain electrons and the halide ions lose electrons. You could remember it as OIL RIG – O xidation I s L oss of electrons, R eduction I s G ain of electrons. Redox reactions involve both oxidation (loss of electrons ) and reduction (gain of electrons).
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