From Atoms to Materials

Extension Checkpoint 13.2D 1. Circle T for a true statement and F for a false one. (a) An ion carries either a positive charge or a negative charge. T / F (b) When an atom forms an ion, its atomic number remains unchanged. T / F (c) When an atom forms an ion, its mass number remains unchanged. T / F 2. (a) Cations are ions with a (positive / negative) charge. (b) Anions are ions with a (positive / negative) charge. 3. Write the chemical symbols of the following ions. (a) chloride ion (c) aluminium ion (b) hydrogen ion (d) oxide ion 4. Name the following ions. (a) K + ion (b) Mg 2+ ion (c) Br − ion (d) S 2− ion 28 © United Prime Educational Publishing (HK) Limited 2024 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publisher. Sample