General Chemistry 10th Edition

Published by Cengage Learning
ISBN 10: 1-28505-137-8
ISBN 13: 978-1-28505-137-6

Chapter 2 - Atoms, Molecules, and Ions - Questions and Problems - Page 87: 2.138

Answer

Please see the work below.

Work Step by Step

We know that sulfur has atomic number 16 hence $S^{+2}$ has 16 minus 2 that is 14 electrons which is the number of neutrons in the unknown ion. The number of protons is 27 minus 14 that is 13, hence the element is aluminium.
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