Ions and ionic bonds — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

14 Which statement describes how magnesium atoms and nitrogen atoms combine to form magnesium nitride, Mg3N2? A Each magnesium atom loses three electrons and each nitrogen atom gains two electrons. B Each magnesium atom loses two electrons and each nitrogen atom gains three electrons. C Each nitrogen atom loses three electrons and each magnesium atom gains two electrons. D Each nitrogen atom loses two electrons and each magnesium atom gains three electrons.

1 marks

Answer: B

This question in 0654/21 May/June 2017

14 Which row shows the electronic structure of a calcium atom and of a fluoride ion? calcium atom fluoride ion A 2,8,8 2,7 B 2,8,8 2,8 C 2,8,8,2 2,7 D 2,8,8,2 2,8

1 marks

Answer: D

This question in 0654/23 May/June 2017

21 Which statement describes the structure of sodium chloride? A contains alternating positive and negative ions B contains an irregular arrangement of ions C contains positive ions only D is a giant covalent structure

1 marks

Answer: A

This question in 0654/23 May/June 2017

20 Element X has two outer-shell electrons. Element Y has seven outer-shell electrons. Which statement about X and Y is not correct? A Element X combines with element Y to form an ionic compound. B Element X combines with element Y to form a solid compound which conducts electricity. C Element X conducts electricity and element Y is in Group VII of the Periodic Table. D Element X is in Group II of the Periodic Table and element Y does not conduct electricity.

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2017

21 The electronic structures of four particles are shown. 1 2 3 4 Which diagrams represent the electronic structures of a Group VI atom and its ion? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2018

15 Which compound is formed when one metal atom transfers two electrons to one non-metal atom? A calcium chloride B calcium oxide C sodium chloride D sodium oxide

1 marks

Answer: B

This question in 0654/21 May/June 2020

15 What happens to rubidium atoms and to oxygen atoms when they form rubidium oxide, Rb2O? rubidium atoms oxygen atoms A gain one electron each lose one electron each B gain one electron each lose two electrons each C lose one electron each gain one electron each D lose one electron each gain two electrons each

1 marks

Answer: D

This question in 0654/22 May/June 2020

16 Which row explains why the melting points of covalent compounds are lower than those of ionic compounds? covalent compound ionic compound A strong attractive forces strong attraction between molecules between oppositely charged ions B strong attractive forces weak attraction between molecules between oppositely charged ions C weak attractive forces strong attraction between molecules between oppositely charged ions D weak attractive forces weak attraction between molecules between oppositely charged ions

1 marks

Answer: C

This question in 0654/21 May/June 2021

16 Sodium phosphate, Na3PO4, contains sodium ions, Na+. Aluminium sulfate, Al 2(SO4)3, contains sulfate ions, SO4 2–. What is the formula of aluminium phosphate? A Al PO4 B Al (PO4)2 C Al 2(PO4)3 D Al 3(PO4)2

1 marks

Answer: A

This question in 0654/23 May/June 2022

16 Which statement describes the lattice structure of sodium chloride, NaCl ? A It is a random arrangement of equal numbers of sodium atoms and chlorine atoms. B It is a random arrangement of equal numbers of sodium ions and chloride ions. C It is a regular arrangement of alternating sodium atoms and chlorine atoms. D It is a regular arrangement of alternating sodium ions and chloride ions.

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2022

16 Which statement about ions is not correct? A Atoms form ions by gaining or losing electrons. B Ions are formed by non-metal atoms only when they lose electrons. C Ions in a solid ionic compound form a lattice structure. D Ions with opposite charges attract each other.

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2022

17 The formula of an ammonium ion is NH4 +. The formula of a phosphate ion is PO4 3–. What is the formula of ammonium phosphate? A (NH4)3PO4 B (NH4)2PO4 C NH4PO4 D NH4(PO4)3

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2024

14 The bonding in potassium iodide is ionic. Which row describes the potassium iodide lattice structure? attractive force positive ions negative ions between ions A iodide potassium strong B iodide potassium weak C potassium iodide strong D potassium iodide weak

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2024

16 The electronic configurations of four particles are shown. 1 2 3 4 Which diagrams represent the electronic configurations of a Group VI atom and its ion? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/21 May/June 2025

17 An aluminium atom forms an aluminium ion, Al 3+. Which statement describes what happens to the aluminium atom? A It gains 3 electrons. B It gains 3 protons. C It loses 3 electrons. D It loses 3 protons.

1 marks

Answer: C

This question in 0654/21 May/June 2025

16 Which diagram represents the structure of sodium chloride, NaCl ? A B Na+ Cl – Na+ Cl – Na+ Cl – Cl – Na+ Cl – Na+ C D Cl – Na+ Na+ Na+ Na+ Cl – Na+ Na+ Na+ Cl – Cl – Cl – Cl – Na+ Cl – Cl –

1 marks

Answer: C

This question in 0654/23 May/June 2025

14 Which particle has the same number of electrons in its outer shell as an atom of sodium, 23 Na? 11 A 23 11Na + B 23 11Na  C 24 11Na D 24 12Na 2+

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2025

14 Which row shows the electronic configuration of a calcium atom and of a fluoride ion? calcium atom fluoride ion A 2,8,8 2,7 B 2,8,8 2,8 C 2,8,8,2 2,7 D 2,8,8,2 2,8

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2025

19 P is in Group II of the Periodic Table. Q is a non-metallic element. P reacts with Q to form an ionic compound, P3Q2. What is the charge on the element Q ion in P3Q2? A 1– B 2– C 3– D 4–

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2025