Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 33 - Think and Explain: 67

Answer

The new atomic number is 85 and the mass number is still 218.

Work Step by Step

The atomic number increases by 1 for beta emission, because beta particles carry a charge of -1e. The polonium atom becomes an astatine atom. The mass number stays the same for beta emission, because beta particles have negligible mass. This is discussed on pages 628-629. The periodic table on page 216 is also helpful.
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