C4 - Group 7 elements
- Created by: Naomi
- Created on: 23-01-13 19:55
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- The group 7 elements
- The halogens
- Group seven elements have similar properties as their atoms have seven electrons in their outer shell
- Halogens have similar properties because when they react each atom gains one electron to form a negative ion with a stable electronic structure
- The nearer the outer shell to the nucleus, the easier it is for an atom to gain one electron
- The easier it is to gain the electron the more reactive the halogen
- Travel round in pairs
- Displacement reactions of halogens
- If halogens are bubbled through solutions of metal halides there are two possible outcomes:
- No reaction
- A displacement reaction
- chlorine + potassium bromide ---> potassium chloride + bromine
- The more reactive element will displace the less reactive one
- If halogens are bubbled through solutions of metal halides there are two possible outcomes:
- If electrons are gained the process is called reduction
- The halogens
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