Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 19 - Sections 19.1-19.12 - Exercises - Review Questions - Page 945: 5


An alpha particle is essentially a Helium-4 nucleus, with 2 protons and 2 neutrons. When an alpha particle is emitted, the mass number decreases by 4 and the atomic number decreases by 2.

Work Step by Step

Alpha particles are considered the least dangerous form of radiation because they cannot penetrate the skin to damage any living cells.
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