Chemistry: The Molecular Science (5th Edition)

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

Chapter 18 - Nuclear Chemistry - Questions for Review and Thought - General Questions - Page 817d: 74d



Work Step by Step

Let the missing reactant be $\,^{A}_{Z}X$ where $X$ is the symbol, $Z$ is the atomic number and $A$ is the mass number. As the sum of masses on both sides must be equal: $246+A=254+(4\times1)\implies A=254+4-246=12$ As the sum of charges must be equal: $96+Z=102+(4\times0)$ or $Z=102-96=6$ The symbol of the element with atomic number 6 is $C$. Therefore, the missing reactant is $\,^{12}_{6}C$.
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