Conceptual Physics (12th Edition)

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

Chapter 33 - Think and Explain: 73

Answer

No, it won't be the same element: P will become Si.

Work Step by Step

A positron is a positively-charged electron. The atomic number decreases by 1 for positron emission, because positrons carry a charge of +1e. Phosphorus has an atomic number of 15, so it transmutes to silicon, which has an atomic number of 14. This is discussed on pages 628-629. The periodic table on page 216 is also helpful.
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