Conceptual Physics (12th Edition)

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

Chapter 11 - Think and Explain: 45

Answer

a. Cobalt atoms always have 27 protons (see periodic table). The mass number is the total number of protons and neutrons, so Co-59 has 32 neutrons, and Co-60 has 33. b. The number of orbiting electrons in a neutral atom matches the number of protons, i.e., the atomic number. Neutral cobalt atoms have 27 electrons.

Work Step by Step

This is discussed on pages 215 and 218.
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