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: 2.74g

Answer

$K_2Cr_2O_7$

Work Step by Step

This is an ionic compound. The cation is potassium, which as a cation always has a charge of 1+ because it has one valence electron. The anion is dichromate, $Cr_2O_7$, which has a charge of 2-. To have an electrically neutral atom, there needs to be two atoms of potassium for every one molecule of dichromate.
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