General Chemistry: Principles and Modern Applications (10th Edition)

Published by Pearson Prentice Hal
ISBN 10: 0132064529
ISBN 13: 978-0-13206-452-1

Chapter 2 - Atoms and the Atomic Theory - Exercises - Atomic Number, Mass Number, and Isotopes - Page 62: 28

Answer

Answer: (a): The number of protons = 88, the atomic number of radium (ii): The number of neutrons = 228 - 88 = 140 (iii): 2+ means that it has lost 2 e- from the neutral atom in which e- = p = 88 So there are 88 - 2 = 86 e- in this ion (b): 228.030/(15.9949 ) = 14.2564.

Work Step by Step

Answer: (a): The number of protons = 88, the atomic number of radium (ii): The number of neutrons = 228 - 88 = 140 (iii): 2+ means that it has lost 2 e- from the neutral atom in which e- = p = 88 So there are 88 - 2 = 86 e- in this ion (b): 228.030/(15.9949 ) = 14.2564.
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