Edexcel IGCSE Chemistry · Spec 1.18-1.19
The Periodic Table & Electronic Configuration
How the periodic table is arranged and how to write electronic configurations.
Chemistry revision video
The Periodic Table & Electronic Configuration
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Spec 1.18-1.19
What you need to know
- Describe how the periodic table is arranged
- Work out the electronic configuration of an atom
- Link that configuration to an element's group and period
Active recall
Quick check
Answer each question before opening the answer.
What do the group number and period number tell you about an atom?
The group number gives the number of electrons in the outer shell; the period number gives the number of occupied electron shells.
Give the electronic configuration of a sodium atom (11 electrons).
2, 8, 1.
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