Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 75: 2.28a


Protons: 15 Neutrons: 17

Work Step by Step

The atomic number of phosphorous is 15, meaning that there are 15 protons (the atomic number is the number of protons). Because it is Phosphorous-32, the atomic mass number of this isotope is 32 amu. Both protons and neutrons weigh one amu while electrons are essentially weightless, so this means that there must be 17 neutrons (15 protons+17 neutrons= 32 amu).
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