Some drinking water supplies contain fluoride ions, which are added to help prevent tooth decay.
Explain, in terms of electrons, how a fluorine atom, F, forms a fluoride ion, F−\text{F}^-F−.
Practise Edexcel GCSE Chemistry Ionic bonding with exam-style questions for Foundation and Higher tier. 42 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.