Words of This Topic
| Word | Meaning |
| Group | The vertical column holding elements of similar properties |
| Period | The horizontal row holding elements whose properties change step by step |
| Shell | The circular path inside an atom on which electrons move |
| Outermost shell | The last shell, whose electrons take part in reactions |
| Atomic size | The size of an atom, shown by the distance from nucleus to outermost shell |
| Valency | The number showing the combining capacity of one atom with another |
| Metallic character | The ability to give away electrons |
| Non metallic character | The ability to take in electrons |
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