Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 2 - Atoms, Molecules, and Ions - Exercises - Page 76: 2.57b

Answer

Charge: +3

Work Step by Step

Atoms of elements want to have the electron configuration of the nearest noble gas (in terms of number of electrons) on the periodic table. Because Aluminum is in group 3A, it must lose three electrons in order to have the same electron configuration as the nearest noble gas, Neon, meaning that its most stable ion will have a charge of +3.
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