Electronic Configuration
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About this topic
This topic covers the arrangement of electrons in shells (electronic configuration) for the first 20 elements, aligning with the Zambia Competence-Based Curriculum. You will learn to apply the 2n² rule, understand duplet and octet rules, and draw atomic structures. This knowledge directly links an element's position on the Periodic Table to its properties, helping you classify elements as metals or non-metals based on valence electrons. Understanding electronic configuration is essential for explaining chemical bonding, reactivity, and periodicity in later forms. ECZ examinations frequently include questions on drawing configurations and predicting valency, making this a vital topic for exam preparation and continuous assessment.
What you'll practise (8 questions)
- Use a copy of the Periodic Table to identify, by name and chemical symbol, the element which has an electronic configuration of 2, 8, 18, 8, 1.
- The diagram below shows the atomic structure of an element. What is the electronic configuration of the ion formed by the same element?
- Name the element with electronic configuration: 2,8,18,7.
- Use the Periodic Table to state the name of the element with electronic configuration: 2,8,18,7.
- What is the electronic configuration of a sodium atom (Na)?
- What is the electronic configuration of a chlorine atom (Cl)?
- What is the electronic configuration of a magnesium atom (Mg)?
- What is the electronic configuration of an oxygen atom (O)?
Answer each question above to see the correct answer and a full explanation.