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 77: 2.59c


Name: Aluminum Iodide Formula: AlI$_{3}$

Work Step by Step

Aluminum wants to get rid of 3 electrons, each iodine atom wants another electron, therefore two ions are formed. Al$^{3+}$ and I$^{-}$, therefore you need three iodine ions for every one aluminum ion, therefore the formula is AlI$_{3}$. When naming ionic compounds, the positively charged ion keeps its name and the negatively charged ion has its ending dropped and replaced with -ide. Hence, the name is Aluminum Iodide.
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