Periodicity of other elements
Periodicity of other elements
- The same patterns work for any group or period.
- Knowing the trends lets you predict and deduce an element's behaviour.
- This is the real power of the Periodic Table.
Practice
The same periodic patterns apply to any group or period, not just Period 3.
Periodicity is general — once you know the trends, they apply across the whole table.
Predict from position
- From an element's position, you can predict its properties.
- E.g. a Group 1 element is a reactive metal that forms a +1 ion.
- A Group 17 element is a reactive non-metal forming a −1 ion.
Practice
From its position, what can you predict about a Group 1 element?
Group 1 elements are reactive metals with one outer electron, forming +1 ions.
Deduce from properties
- You can also work backwards.
- From an unknown element's physical and chemical properties, deduce its likely position and identity.
Practice
Periodicity also lets you:
Working backwards from physical and chemical properties, you can place an unknown element in the table.
You've got it
Key idea
- the same periodic patterns apply to every group and period
- predict properties from position (Group 1 → reactive metal, +1 ion)
- deduce an unknown element's position/identity from its properties