Chemistry › Section B · Atoms, molecules, and ions › Topic B.4
The periodic table
The periodic table is not just a list of 118 elements: it is a map in which position predicts behaviour. Knowing how it was built, and how to read its rows, columns and regions, lets you forecast how an element you have never met is likely to act.
In this topic
- Order among the elements
- Mendeleev's bold predictions
- Worked example: predicting a missing element
- Atomic number, not mass
- Reading the modern table
- Metals, nonmetals and metalloids
- Main groups and transition metals
- Families with names
- Worked example: placing an element
- Common mistakes to avoid
- Key takeaways
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