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3.1 Elements from the Sea

Group 7 Halogens
Have 7 electrons in their outer shell
Most reactive group of non-metals
Occur naturally as diatomic molecules e.g. Br2, Cl2, As2

They achieve stability by:

Forming a halide ion and gaining an electron from a metal in an ionic bond
Sharing an…

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Halogens push less reactive halogens from a compound. This is called a displacement reaction:

This reaction is also a redox reaction as both oxidation and reduction take place.
Halogens replace less reactive halides.

Halogens in cyclohexane Halides reacting with silver to form precipitates

Halide ions react with silver ions to…


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