Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 2 - Problems: 2.51

Answer

Iodine (Z =53) has the higher atomic number because it has more # of protons/electrons than tellurium (Z =52) but has lesser number of the summation of protons and neutrons. Since mass number is the sum of protons and neutrons, it has a lower atomic mass than tellurium (Z =52)

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