Lithium fluoride crystals are used to make lenses for some scientific instruments. Lithium fluoride is made by reacting lithium with fluorine.
Lithium has atomic number 3. Fluorine has atomic number 9.
Give the electronic configuration of a lithium atom.
Describe how a lithium atom and a fluorine atom form ions when they react.
The table shows information about a lithium ion and a fluoride ion.
| Ion | Mass number | Number of protons | Number of neutrons | Number of electrons |
|---|---|---|---|---|
| Li+\mathrm{Li^{+}}Li+ | 7 | 3 | ||
| F−\mathrm{F^{-}}F− | 19 |
Complete the table.
Name the noble gas that has the same electronic configuration as a fluoride ion.
Explain why the formula of lithium fluoride is LiF.
56 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.