Isotopes — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

14 The proton number of element X is 44. Its nucleon number is 145. How many neutrons are there in an atom of X? A 44 B 101 C 145 D 189

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2007

14 Element X has a proton number of 24 and a nucleon number of 52. How many electrons and neutrons are there in an atom of X? electrons neutrons A 24 28 B 24 52 C 28 24 D 28 52

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2008

40 What are carbon-12 and carbon-14? A atoms of different elements with different nuclear masses B atoms of different elements with the same nuclear mass C atoms of the same element with different nuclear masses D atoms of the same element with the same nuclear mass

1 marks

Answer: C

This question in 0654/11 May/June 2012

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key n p p proton n n p p n n p p p p n p p p n n neutron n n p Which two diagrams represent isotopes of the same element? A V and W B W and X C X and Y D Y and V

1 marks

Answer: D

This question in 0654/12 May/June 2012

15 The symbol for an atom of neon is 20 Ne. 10 Which statement about the atom is correct? A It contains half as many neutrons as protons. B It contains twice as many neutrons as protons. C The number of neutrons equals the number of protons. D The total number of neutrons and protons is thirty.

1 marks

Answer: C

This question in 0654/13 May/June 2012

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key n p p proton n n p p n n p p p p n p p p n n neutron n n p Which two diagrams represent isotopes of the same element? A V and W B W and X C X and Y D Y and V

1 marks

Answer: D

This question in 0654/13 May/June 2012

40 Which row compares the number of protons and the number of neutrons in atoms of different isotopes of an element? number of number of protons neutrons A different different B different the same C the same different D the same the same

1 marks

Answer: C

This question in 0654/11 May/June 2013

40 Which row correctly compares the number of neutrons in atoms of two different isotopes of an element and states whether the isotopes must be radioactive? number of must be neutrons radioactive? A must be different no B must be different yes C must be the same no D must be the same yes

1 marks

Answer: A

This question in 0654/12 May/June 2013

40 Which row compares the number of protons and the number of neutrons in atoms of different isotopes of an element? number of number of protons neutrons A different different B different the same C the same different D the same the same

1 marks

Answer: C

This question in 0654/13 May/June 2013

40 The table gives the nucleon number and the proton number of three atoms X, Y and Z. nucleon number proton number X 35 17 Y 37 17 Z 37 18 Which of these atoms are isotopes of the same element? A X and Y only B X and Z only C Y and Z only D X, Y and Z

1 marks

Answer: A

This question in 0654/11 May/June 2014

40 The table gives the nucleon number and the proton number of three atoms X, Y and Z. nucleon number proton number X 35 17 Y 37 17 Z 37 18 Which of these atoms are isotopes of the same element? A X and Y only B X and Z only C Y and Z only D X, Y and Z

1 marks

Answer: A

This question in 0654/13 May/June 2014

40 The table compares an atom of carbon-13 and an atom of nitrogen-14. carbon-13 nitrogen-14 nucleon number A 6 7 proton number Z 13 14 A neutral atom of carbon-13 and a neutral atom of nitrogen-14 have the same number of A electrons. B ions. C neutrons. D protons.

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2015

16 The diagram shows a helium atom. e p n n p e Which particles in the helium atom have approximately the same mass? A electron and proton only B electron and neutron only C proton and neutron only D electron, proton and neutron

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2015

40 The table compares an atom of carbon-13 and an atom of nitrogen-14. carbon-13 nitrogen-14 nucleon number A 6 7 proton number Z 13 14 A neutral atom of carbon-13 and a neutral atom of nitrogen-14 have the same number of A electrons. B ions. C neutrons. D protons.

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2015

40 The table compares an atom of carbon-13 and an atom of nitrogen-14. carbon-13 nitrogen-14 nucleon number A 6 7 proton number Z 13 14 A neutral atom of carbon-13 and a neutral atom of nitrogen-14 have the same number of A electrons. B ions. C neutrons. D protons.

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2015

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key p n p proton p p n n n n p p p p n p p p n n neutron p n n Which two diagrams represent isotopes of the same element? A V and W B W and X C X and Y D Y and V

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2016

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key p n p proton p p n n n n p p p p n p p p n n neutron p n n Which two diagrams represent isotopes of the same element? A V and W B W and X C X and Y D Y and V

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2016

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key p n p proton p p n n n n p p p p n p p p n n neutron p n n Which two diagrams represent isotopes of the same element? A V and W B W and X C X and Y D Y and V

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2016

40 Which row compares the number of protons and the number of neutrons in atoms of different isotopes of an element? number of number of protons neutrons A different different B different the same C the same different D the same the same

1 marks

Answer: C

This question in 0654/11 May/June 2017

40 Which row compares the number of protons and the number of neutrons in atoms of different isotopes of an element? number of number of protons neutrons A different different B different the same C the same different D the same the same

1 marks

Answer: C

This question in 0654/12 May/June 2017

40 Which row compares the number of protons and the number of neutrons in atoms of different isotopes of an element? number of number of protons neutrons A different different B different the same C the same different D the same the same

1 marks

Answer: C

This question in 0654/13 May/June 2017

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2017

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2017

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2017

16 An atom of sodium is represented by 23 Na. 11 Which row shows the number of protons and the number of neutrons in this atom? number of number of protons neutrons A 11 12 B 11 23 C 12 11 D 12 23

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2018

40 The atomic number of an isotope is 6 and the mass number is 14. How many neutrons and how many protons are in the nucleus of an atom of this isotope? neutrons protons A 8 6 B 8 8 C 14 6 D 14 8

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2018

40 There are three different isotopes of hydrogen. 1 H H 2 H 3 1 1 1 Which statement about the nuclei of these three isotopes is correct? A They have different numbers of electrons. B They have the same number of nucleons. C They have the same number of neutrons. D They have the same number of protons.

1 marks

Answer: D

This question in 0654/11 May/June 2019

15 Which row compares the nucleus and the electronic structure of two isotopes of the same element? nucleus electronic structure A different different B different same C same different D same same

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2019

15 One atom of an isotope of fluorine is represented by 15 F . 9 How many neutrons does this atom have? A 6 B 9 C 10 D 15

1 marks

Answer: A

This question in 0654/11 May/June 2020

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key n p n p proton p p n n n n p p p p n p p p n n neutron p n n n Which two diagrams represent isotopes of the same element? A V and Y B W and X C X and Y D Y and W

1 marks

Answer: C

This question in 0654/11 May/June 2020

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key n p n p proton p p n n n n p p p p n p p p n n neutron p n n n Which two diagrams represent isotopes of the same element? A V and Y B W and X C X and Y D Y and W

1 marks

Answer: C

This question in 0654/12 May/June 2020

15 One isotope of oxygen is 16 O . 8 Which diagram represents a different isotope of oxygen? A B 9p 9p 9n 8n C D 8p 8p 8n 9n

1 marks

Answer: D

This question in 0654/13 May/June 2020

40 The diagrams represent the nuclei of four different atoms V, W, X and Y. V W X Y key n p n p proton p p n n n n p p p p n p p p n n neutron p n n n Which two diagrams represent isotopes of the same element? A V and Y B W and X C X and Y D Y and W

1 marks

Answer: C

This question in 0654/13 May/June 2020

39 The table compares an atom of carbon-13 and an atom of nitrogen-14. carbon-13 nitrogen-14 nucleon number A 13 14 proton number Z 6 7 What do the neutral atom of carbon-13 and the neutral atom of nitrogen-14 have the same number of? A electrons B ions C neutrons D protons

1 marks

Answer: C

This question in 0654/12 Feb/March 2021

40 The table gives information about four nuclides P, Q, R and S. number of number of nuclide protons neutrons P 81 123 Q 82 122 R 82 123 S 83 121 Which nuclides are isotopes of the same element? A P and Q B P and R C Q and R D Q and S

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2021

14 The protons, neutrons and electrons in a particle are shown. key proton neutron electron Which symbol represents this particle? A F B F – C Ne D Ne+

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2021

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2022

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2022

15 How many neutrons are in one atom of the isotope 35 17C ? l A 17 B 18 C 35 D 52

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2022

40 The diagrams represent pairs of nuclei of some atoms. Which pair shows nuclei of different isotopes of the same element? A B key neutron proton C D

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2022

16 An atom of osmium is represented by 190 76Os. How many neutrons are in this atom? A 76 B 114 C 190 D 266

1 marks

Answer: B

This question in 0654/12 May/June 2023

40 A nuclide of hydrogen is represented by H. 3 1 Which row shows the number of protons and the number of neutrons in this nuclide? protons neutrons A 1 2 B 1 3 C 2 1 D 3 1

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2023

15 Which statement about isotopes of the same element is correct? A They have the same number of protons but different number of electrons. B They have the same number of protons but different number of neutrons. C They have the same number of neutrons but different number of electrons. D They have the same number of neutrons but different number of protons.

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2023

16 X and Y are isotopes of the same element. Which statement about X and Y is correct? A They have the same nucleon number but different numbers of protons. B They have the same number of neutrons but different numbers of electrons. C They have the same atomic number but different numbers of electrons. D They have the same number of protons but different numbers of neutrons.

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2023

15 Which row shows the particles in the nucleus of an atom of 25 Mg? 12 protons neutrons A 12 12 B 12 13 C 13 12 D 13 13

1 marks

Answer: B

This question in 0654/12 Feb/March 2024

39 An atom of an isotope of strontium (Sr) has a proton number of 38 and contains 52 neutrons. What is the nuclide notation for this isotope? A 52 Sr B 90 Sr C 38 Sr D 90 Sr 38 38 52 52

1 marks

Answer: B

This question in 0654/12 May/June 2024

39 An atom of an isotope of strontium (Sr) has a proton number of 38 and contains 52 neutrons. What is the nuclide notation for this isotope? A 52 Sr B 90 Sr C 38 Sr D 90 Sr 38 38 52 52

1 marks

Answer: B

This question in 0654/13 May/June 2024

39 An element has two isotopes. Which statement about the nuclei of atoms of these isotopes is correct? A They have equal numbers of neutrons but different numbers of electrons. B They have equal numbers of neutrons but different numbers of protons. C They have equal numbers of protons but different numbers of electrons. D They have equal numbers of protons but different numbers of neutrons.

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2024

15 One atom of an isotope of fluorine is represented by 15 F. 9 How many neutrons does this atom have? A 6 B 9 C 10 D 15

1 marks

Answer: A

This question in 0654/12 Feb/March 2025

15 What is the nucleon number of the potassium isotope 40 K? 19 A 19 B 21 C 40 D 59

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2025