Unit 1: Structure 1: Models of the Particulate Nature of Matter
Topic 1.3: Electron Configurations Questions
Practice 6 exam-style questions for IB Chemistry Topic 1.3. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State2 marks
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State the shape of an s orbital and the shape of a p orbital, and state how many p orbitals make up a p sublevel. [2]
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Deduce the maximum number of electrons that can occupy the third main energy level (n = 3), and name the three sublevels it contains. [2]
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State the full electron configuration of a calcium atom (Z = 20), and explain why 4s is written before 3d in the filling order.
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Explain how the line emission spectrum of hydrogen provides evidence that the electron occupies discrete energy levels. [2]
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The lines in the hydrogen emission spectrum get closer together (converge) toward the high-frequency end.
(a) State what this convergence tells us about the energy levels.
(b) State, with a reason, which transition emits the highest-energy photon. [3]
(a) State what this convergence tells us about the energy levels.
(b) State, with a reason, which transition emits the highest-energy photon. [3]
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Deduce the full electron configuration of the chromium(III) ion, Cr³⁺.
(Chromium has atomic number 24.)
(Chromium has atomic number 24.)
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