Isotopes — Paper 1 · IGCSE Chemistry (9-1) 0971

4 In which atom is the number of protons equal to the number of neutrons? A 40Ar B 19F C 23Na D 16O

1 marks

Answer: D

This question in 0971/11 May/June 2018

5 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 0971/11 May/June 2019

6 An isotope of lithium has the symbol Li 7 . 3 What is the arrangement of electrons in one atom of this isotope of lithium? A B C D

1 marks

Answer: A

This question in 0971/12 Oct/Nov 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 0971/11 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 0971/12 May/June 2020

6 Which statement about atomic structure is correct? A Isotopes have a different nucleon number but the same proton number. B Metal atoms gain electrons to achieve a noble gas electronic structure. C The nucleon number is the total number of electrons and neutrons in the nucleus of the atom. D Protons and neutrons are oppositely charged particles.

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2020

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 0971/12 Oct/Nov 2021

6 Information about the structures of three atoms, X, Y and Z, is shown. proton nucleon atom number number X 1 1 Y 1 2 Z 1 3 Which statements about atoms X, Y and Z are correct? 1 They are isotopes of the same element. 2 They contain the same number of electrons. 3 They contain the same number of neutrons. 4 They contain one occupied electron shell. A 1, 2 and 4 B 1 and 2 only C 3 and 4 D 3 only

1 marks

Answer: A

This question in 0971/11 May/June 2022

4 X and Y are two different elements. X and Y have the same number of nucleons. Which statement about X and Y is correct? A They have the same physical properties. B Their atoms have the same number of electrons. C They are in different groups of the Periodic Table. D They have different relative masses.

1 marks

Answer: C

This question in 0971/12 May/June 2022

4 How many neutrons are present in one atom of 35 C l ? 17 A 17 B 18 C 35 D 52

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2022

4 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 0971/11 May/June 2023

4 Which statement describes isotopes of the same element? A They have different electron arrangements. B They have different nuclear charges. C They have nuclei with masses that are the same. D They have the same number of protons.

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2023

6 Isotopes of the same element have some features that are the same and some that are different. Which row shows the features that are the same and those that are different? nucleon proton number of number number outer shell electrons A ✓ ✓ ✗ key B ✗ ✓ ✓ ✓= same C ✓ ✗ ✗ ✗= different D ✗ ✗ ✓

1 marks

Answer: B

This question in 0971/12 May/June 2024

6 The symbols represent four atoms. The letters used are not the usual atomic symbols. 40 W 40 X 46 Y 46 Z 20 19 20 22 Which atoms are isotopes of the same element? A W and X B W and Y C X and Y D Y and Z

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2024

5 Which row identifies the number of electrons, neutrons and protons in a particle which is an isotope of 11 B? 5 electrons neutrons protons A 5 5 5 B 5 6 5 C 6 5 6 D 6 6 6

1 marks

Answer: A

This question in 0971/11 May/June 2025

6 What is different for isotopes of the same element? A nucleon number B number of electron shells C number of electrons in the outer electron shell D proton number

1 marks

Answer: A

This question in 0971/12 May/June 2025

6 What is defined as different atoms of the same element with the same number of protons but different numbers of neutrons? A homologous series B isotopes C mass number D the group number

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2025