From Atoms to Materials

helium Group VII elements (fluorine, chlorine, bromine, iodine, astatine) bromine iodine chlorine (helium, neon, argon, krypton, xenon, radon) Group VIII elements neon argon disinfectant 消毒劑 I II III IV V VI VII VIII Group I Br Cl F At I II III IV V VI VII VIII Group Xe Kr Ar Ne He Rn • non-metals • poisonous •  have similar chemical properties (e.g. react with metals to form salts) Properties Uses Chlorine tablets are used to sterilize water in swimming pools. Iodine is used as a disinfectant*. Uses Neon and argon are used in glowing signs. Argon is used for filling traditional light bulbs. •  colourless gases at room conditions • very unreactive Properties 37 13 From Atoms to Materials © 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