plumiShells, sub-shells and orbitals: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 2.2.1.1 Shells, sub-shells and orbitals, 2016–2025, with mark schemes and examiner’s reports where available.
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Q22(a)
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Open the full PDFYour answerQ21(a)
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All 5 questions on Shells, sub-shells and orbitals, as a list
- June 2024, Paper 1, Q22(a) (2 marks): Iron is in the d block of the periodic table and contains s, p and d orbitals. • Draw diagrams to show the shapes of an s orbital and a p orbital. Complete the
- June 2024, AS Paper 1, Q1 (1 mark): Which diagram shows a p‑orbital? A B C D Your answer [1]
- June 2023, AS Paper 1, Q4 (1 mark): How many p-orbitals are occupied by electrons in a sulfur atom? A 2 B 4 C 6 D 10 Your answer [1]
- November 2021, AS Paper 1, Q21(a) (2 marks): Complete the table to show the maximum number of electrons that can occupy each shell and sub-shell. Some boxes may need to be left blank. Sub-shell Total numbe
- November 2020, AS Paper 1, Q21(a) (1 mark): Complete the table to show the number of electrons that can fill the first four shells. Shell 1st shell 2nd shell 3rd shell 4th shell Number of electrons [1]
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