plumiProtons, neutrons and electrons: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 2.1.1 Protons, neutrons and electrons, 2019–2025, with mark schemes and examiner’s reports where available.
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All 18 questions on Protons, neutrons and electrons, as a list
- June 2025, AS Unit 1, Q1 (1 mark): Which row shows the numbers of neutrons and electrons in a bromide ion 79Br– ? Number of Number of neutrons electrons A 44 35 B 44 36 C 46 35 D 46 36
- January 2025, AS Unit 1, Q23(b) (4 marks): The radioactive decay of germanium‑76 forms stable atoms of selenium‑76. Compare and contrast the atomic structure of an atom of germanium‑76 with an atom of se
- October 2024, AS Unit 1, Q9(a) (1 mark): An atom of hydrogen can be represented as 1H. What is the mass, in grams, of this hydrogen atom? (1) A 1.6725 × 10–24 B 1.6734 × 10–24 C 3.3473 × 10–24 D 3.3482
- October 2024, AS Unit 1, Q9(b) (1 mark): Which of the particles would be deflected by an electric field? (1) A electrons only B electrons and protons only C neutrons and protons only D electrons, neutr
- January 2024, AS Unit 1, Q3 (1 mark): Which species does not contain a total of 16 neutrons? A a molecule of ethene, 12C2 1H4 B a molecule of oxygen, 16O2 C an atom of silicon, 30Si D an ion of sulf
- October 2023, AS Unit 1, Q1 (1 mark): An atom of 27 13Al forms the ion, Al3+. What are the numbers of protons, electrons and neutrons in this ion? protons electrons neutrons A 13 13 14 B 10 13 14 C
- January 2023, AS Unit 1, Q6 (1 mark): How many neutrons and electrons are there in 190 79Au2+? Neutrons Electrons A 111 77 B 111 81 C 190 79 D 190 77
- October 2022, AS Unit 1, Q3 (1 mark): An atom of 15 7N forms a nitride ion, N3–. What are the numbers of protons, neutrons and electrons in this ion? Protons Neutrons Electrons A 7 8 7 B 7 8 4 C 7 8
- June 2022, AS Unit 1, Q6(a) (1 mark): What is the number of electrons in a scandium ion, Sc+ ? (1) A 20 B 21 C 22 D 23
- June 2022, AS Unit 1, Q20(b) (2 marks): Complete the table to show the numbers of subatomic particles in the two isotopes of bromine. (2) Isotope Protons Neutrons Electrons bromine‑79 bromine‑81
- January 2022, AS Unit 1, Q20(b)(i) (2 marks): Complete the table to show the numbers of subatomic particles in the atoms of these two isotopes of copper. (2) Isotope Protons Neutrons Electrons 63Cu 65Cu
- October 2021, AS Unit 1, Q13(a)(iii) (1 mark): Complete the table to show the number of protons and neutrons in each isotope of silicon. Number of Number of Isotope protons neutrons 28Si 29Si 30Si (1)
- June 2021, AS Unit 1, Q1 (1 mark): The numbers of subatomic particles present in four species W, X, Y and Z are given in the table. Number of Number of Species Number of protons neutrons electron
- June 2021, AS Unit 1, Q24(a) (1 mark): Complete the table to show the numbers of subatomic particles in 56Fe2+. (1) Number of protons Number of neutrons Number of electrons
- January 2021, AS Unit 1, Q5 (1 mark): Which of these atoms has the most neutrons? 49In A 115 B 124 50Sn C 123 51Sb D 124 52Te
- January 2020, AS Unit 1, Q1 (1 mark): How many protons, neutrons and electrons are in a 37Cl– ion? Protons Neutrons Electrons A 17 20 16 B 17 20 17 C 17 20 18 D 20 17 21
- June 2019, AS Unit 1, Q8 (1 mark): Which statement about subatomic particles is correct? A neutral atoms always contain the same number of protons and electrons B neutral atoms always contain the
- January 2019, AS Unit 1, Q1 (1 mark): The hydroxide ion, OH−, has a total of 9 protons. How many neutrons and electrons are there in this ion? Number of neutrons Number of electrons A 8 8 B 8 10 9 8
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