Words of This Topic
| Word | Meaning |
| Valence shell | The outermost shell of an atom |
| Valence electron | An electron that sits in the outermost shell |
| Valency | The number of electrons an atom gives, takes or shares |
| Electron arrangement | The way electrons are spread over the shells |
| Molecule | The smallest particle of an element or compound that can exist on its own |
| Compound | A substance made of two or more elements joined together |
| Symbol | The short letters that stand for an element, such as Mg for magnesium |
| Molecular formula | The formula of a molecule written in symbols |
| Criss-cross method | The way of writing a formula by swapping the valencies across |
| Stability | The settled state an atom reaches once its outer shell is full |
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