Answer
(a) alpha radiation.
Work Step by Step
The mass number is decreased by 4 when radon-222 is converted to polonium-218. It is the alpha particle emission that causes a decrease of four units in mass number.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 25 Nuclear Chemistry - 25-2 Nuclear Reactions and Radioactive Decay - Review & Check for Section 25-2 - Page 982: 1
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