From Atoms to Materials

The atoms of different elements have different numbers of protons and electrons. They may have different numbers of neutrons. This leads to differences in their properties. The numbers of protons, electrons and neutrons of the atoms of some elements are listed below. Atom Number of protons electrons neutrons Hydrogen 1 1 0 Helium 2 2 2 Lithium 3 3 4 Beryllium 4 4 5 Boron 5 5 6 Carbon 6 6 6 Nitrogen 7 7 7 Oxygen 8 8 8 Fluorine 9 9 10 Neon 10 10 10 Sodium 11 11 12 Magnesium 12 12 12 Aluminium 13 13 14 Silicon 14 14 14 Phosphorus 15 15 16 Sulphur 16 16 16 Chlorine 17 17 18 Argon 18 18 22 Potassium 19 19 20 Calcium 20 20 20 Table 13.2 Numbers of subatomic particles in the atoms of some elements isotope 同位素 Atoms of the same element may have different numbers of neutrons. They are called isotopes* of that element. Only the most abundant isotope of each element is listed here. Can you find any patterns from these data? 15 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