Group 7, the halogens 10.1-10.4

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  • Created by: JadeErin
  • Created on: 17-02-21 21:45

Trends in halgons 

Atomic radius 

radius increases due to there being a whole principle quantum level as you enter each new period 

Electronegativity 

Decreases down the group as shared electrons get further from the nucleus and there is more sheilding by the inner shells. These two factors are more important than the increasing nuclear charge. 

Melting/ boiling point

Increases down the group. Largeratoms have more electrons. Van der waals forces between molecules are stronger. 

F2--> is a yellow gas at room temperature 

Cl2 --> is a green gas at room temperature 

Br2 --> is a red/ brown liquid at room temperature

I2 --> is a black solid at roo temperature 

Reactions of halogens 

When potassium bromide reacts with chlorine the solution turns orange.

When potassium iodine reacts with chlorine the solution turns brown.

When potassium chloride is mixed with bromine there is no reaction. 

When potassium iodide reacts with bromine the solution turns brown.

When potassium chloride is mixed with iodide there is no reaction.

When potassium bromide is mixed with iodine there is no…

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