Electronic Structure & Periodic Table — GCSE Chemistry Revision
Revise Electronic Structure & Periodic Table for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Groups & PeriodsWhat is Electronic Structure & Periodic Table?
The electronic structure of an atom describes the arrangement of its electrons in energy levels or shells. The periodic table is arranged in order of atomic number, and elements in the same group have the same number of electrons in their outer shell, giving them similar chemical properties.
Board notes: Understanding the link between electronic structure and the periodic table is crucial. All boards expect you to be able to deduce the electronic structure of an element from its position in the periodic table and vice versa.
Step-by-step explanationWorked example
The electronic structure of chlorine (atomic number 17) is 2,8,7. It has 2 electrons in the first shell, 8 in the second, and 7 in the third (outer) shell. This places it in Group 7 of the periodic table.
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Common mistakes
- 1Incorrectly filling electron shells. Remember the first shell holds up to 2 electrons, and the second and third shells hold up to 8 electrons.
- 2Confusing groups and periods. Groups are the vertical columns, and periods are the horizontal rows.
- 3Forgetting that the group number (for main group elements) corresponds to the number of outer shell electrons.
Electronic Structure & Periodic Table exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Electronic Structure & Periodic Table
Core concept
The electronic structure of an atom describes the arrangement of its electrons in energy levels or shells. The periodic table is arranged in order of atomic number, and elements in the same group have…
Frequently asked questions
Why do elements in the same group have similar properties?
Elements in the same group have the same number of electrons in their outer shell. This means they react in a similar way, as the outer shell electrons are involved in chemical bonding.
How is the periodic table arranged?
The periodic table is arranged by increasing atomic number. The rows are called periods, and the columns are called groups.