ZIMSEC O-Level Chemistry
Elements and compounds
Elements and compounds in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic51 practice questions3 lessons
Overview
Form 3 (competency matrix 8.3.2, headed 'Elements'): chemical symbols, atomic and mass numbers, nuclide notation, electronic configuration of the first 20 elements and isotopes.
Learning objectives
What the syllabus expects you to be able to do.
- 7.1.3.2Represent elements by their chemical symbols.
- 7.1.3.3Use and interpret nuclide notation, working out the numbers of protons, neutrons and electrons from atomic numbers and mass numbers.
- 7.1.3.4Deduce the electronic configuration of an element (first 20 elements) from given data and show it in a dot-and-cross diagram.
- 7.1.3.5Explain the concept of an isotope.
Lessons
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Electronic configuration
25 min
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Elements, compounds and mixtures
25 min
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Isotopes
25 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Exam style
Turn Elements and compounds into a strength.
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