Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises: 64

Answer

a. Protons: 12 Neutrons: 12 Electrons: 12 b. Protons: 12 Neutrons: 12 Electrons: 10 c. Protons: 27 Neutrons: 32 Electrons: 25 d. Protons: 27 Neutrons: 32 Electrons: 24 e. Protons: 27 Neutrons: 32 Electrons: 27 f. Protons: 34 Neutrons: 46 Electrons: 34 g. Protons: 34 Neutrons: 45 Electrons: 36 h. Protons: 28 Neutrons: 35 Electrons: 28 i. Protons: 28 Neutrons: 31 Electrons: 26

Work Step by Step

We use the following formula to derive the number of neutrons in each case: Number of neutrons = atomic mass (top number) - atomic number (bottom number) When the atom is an ion, we add extra or subtract the number of electrons depending on the charge. When the charge is negative, we add extra electrons. Conversely, when the charge is positive, we subtract electrons from the atomic number.
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