Atomic structure — KCSE Chemistry
KCSE Chemistry · 66 practice questions · 4 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Describe the structure of the atom in terms of protons, neutrons and electrons with their relative masses and charges
Define atomic number, mass number, isotopes and relative atomic mass and perform calculations using these concepts
Write the electronic configuration of elements with atomic numbers 1–20
Atomic structure
Sample Questions
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Identify the electronic configuration of the element with atomic number 12 and state its group in the periodic table. (3 marks)
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An element X has atomic number 15 and mass number 24. (a) State the number of protons, neutrons and electrons in a neutral atom of X. (b) Write the electronic configuration of X.
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An element X has atomic number 6 and mass number 12. (a) State the number of protons, neutrons and electrons in a neutral atom of X. (b) Write the electronic configuration of X.
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An element X has atomic number 20 and mass number 40. (a) State the number of protons, neutrons and electrons in a neutral atom of X. (b) Write the electronic configuration of X.
Why Practise Atomic structure?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
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