From Atoms to Materials

17. Which of the following metals usually exists as an element in nature? A. Calcium B. Iron C. Copper D. Gold 13. Which of the following diagrams correctly show the relationship between oxygen atom(s), oxygen molecule(s) and subatomic particles? A. B. C. D. Multiple-choice Choose the best answer for each question. 14. Which of the following elements is a non-metal? A. Copper B. Chlorine C. Silicon D. Calcium 15. An atom has a mass number of 35. It has 17 protons. Which of the following combinations about its subatomic particles is correct? Number of neutrons Number of electrons A. B. C. D. 18 20 18 20 17 17 18 18 16. Which of the following is a compound? A. B. C. D. represents atom X represents atom Y represents atom X represents atom Y represents atom X represents atom Y protons electrons an oxygen atom oxygen molecules neutrons is made up of two consist of protons electrons an oxygen molecule oxygen atoms neutrons is made up of two consist of protons electrons an oxygen atom neutrons oxygen atoms is made up of two consist of protons oxygen molecules a neutron electrons oxygen atoms is made up of two consist of 114 Chapter Exercise © 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