Atomic structure and the Periodic Table — Paper 2 · IGCSE Chemistry (9-1) 0971

5 Chlorine exists as two common isotopes, 35Cl and 37Cl. Information about these two isotopes is shown. number of number of number of protons neutrons electron shells 35Cl 17 18 3 37Cl 17 20 3 Which statement explains why the two isotopes are of the same element? A Both have the same number of electron shells. B Both have the same number of protons. C Both have 7 outer shell electrons. D 37Cl has 2 more neutrons than 35Cl.

1 marks

Answer: B

This question in 0971/21 May/June 2018

4 Which statement about an atom of fluorine, 19 9 , is correct? F A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.

1 marks

Answer: B

This question in 0971/21 May/June 2019

4 The atomic number and nucleon number of a potassium atom are shown. potassium atom atomic number 19 nucleon number 39 How many protons, neutrons and electrons are in a potassium ion, K+? protons neutrons electrons A 19 20 18 B 19 20 20 C 20 19 18 D 20 19 19

1 marks

Answer: A

This question in 0971/21 May/June 2020

4 The diagram shows the electronic structure of a particle with a nucleon number (mass number) of 40. e e e e e e e e e e e 40 e e e e e e e The table shows the suggestions that three students, 1, 2 and 3, made to identify the particle. student 1 2 3 particle Ar Cl Ca2+ Which students are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 0971/22 May/June 2020

4 Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct? A Y has more electron shells than X. B Y has more electrons in its outer shell than X. C Y is in a different group of the Periodic Table from X. D Y is in the same period of the Periodic Table as X.

1 marks

Answer: A

This question in 0971/21 May/June 2021

4 Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct? A Y has more electron shells than X. B Y has more electrons in its outer shell than X. C Y is in a different group of the Periodic Table from X. D Y is in the same period of the Periodic Table as X.

1 marks

Answer: A

This question in 0971/22 May/June 2021

4 How many protons, neutrons and electrons are there in one atom of the isotope 27 13Al ? protons neutrons electrons A 13 13 13 B 13 14 13 C 14 13 13 D 14 14 13

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2021

3 The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown. number of number of electronic protons neutrons structure W 8 8 2,8 X 8 10 2,6 Y 8 8 2,6 Z 10 8 2,8 Which particles have the same chemical properties? A W and Y B W and Z C X and Y D X and Z

1 marks

Answer: C

This question in 0971/21 May/June 2022

3 The atomic structures of four particles, W, X, Y and Z, are shown. electrons neutrons protons W 2 2 2 X 2 2 3 Y 2 3 2 Z 3 2 3 Which particles are isotopes of the same element? A W and X B W and Y C X and Y D X and Z

1 marks

Answer: B

This question in 0971/21 May/June 2023

5 Nitrogen forms a nitride ion with the formula N3–. Which particle does not have the same electronic configuration as the nitride ion? A Al 3+ B Cl – C Na+ D O2–

1 marks

Answer: B

This question in 0971/21 May/June 2023

2 An atom of element X contains: ● 5 protons ● 6 neutrons ● 5 electrons. Which statements about element X are correct? 1 X has an atomic number of 6. 2 X has a nucleon number of 11. 3 X is in Group II of the Periodic Table. 4 X is in the second period of the Periodic Table. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0971/22 May/June 2023

3 A representation of an atom is shown. – + + – – + + – – + + – What is the nucleon number of this atom? A 6 B 7 C 12 D 13

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2023

4 Four statements about atoms are listed. 1 The centre of an atom is positively charged. 2 Protons and electrons are located in the nucleus. 3 Protons and electrons have the same mass. 4 Most of the mass of an atom is in the nucleus. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0971/21 May/June 2024

3 Which row gives the number of protons, electrons and neutrons in an atom of zinc? protons electrons neutrons A 30 30 35 B 30 35 35 C 35 30 30 D 35 35 30

1 marks

Answer: A

This question in 0971/22 May/June 2025

4 Which particles have the electronic configuration 2,8,8? 1 an argon atom, Ar 2 an aluminium ion, Al 3+ 3 a sodium ion, Na+ 4 a chloride ion, Cl – A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: B

This question in 0971/22 May/June 2025

5 Which statement about atoms or ions is correct? A The mass number of an atom is the total number of nucleons and protons. B The electronic configuration of an aluminium ion, Al 3+, is 2,8,3. C Hydrogen is the only atom that has an incomplete first electron shell. D Most of the volume of an atom is taken up by its nucleus.

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2025