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 90a: 11d

Answer

Se

Work Step by Step

We see that As has an atomic number of 33, so it has 33 protons. We look for the element that has 33 neutrons. The number of neutrons is equal to the atomic number minus the number of protons. Recalling this, we find that Se is the right option.
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