Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 2 - Chemical Compounds - Questions for Review and Thought - Topical Questions - Page 90b: 25c

Answer

$^{129}_{54}Xe$

Work Step by Step

Recall, the superscript gives the number of protons plus the number of neutrons, so add the number of protons and the number of neutrons to get this number. The subscript, contrarily, indicates the number of protons present. Lastly, the symbol indicates the element present. We find the mass number and then complete the entire symbol. Mass number = 54 protons+ 75 Neutrons = 129 This gives: $^{129}_{54}Xe$
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