## Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning

# Chapter 7 The Structure of Atoms and Periodic Trends - 7-6 Periodic Trends and Chemical Properties - Case Study - Questions - Page 278: 1

#### Answer

Choice (a) MgCl is the correct answer choice.

#### Work Step by Step

The question is asking for the incorrect chemical formula of the compounds given. All answer choices contain the Cl$^{-}$ ion which means that we only have to look at the metal ions. Choice (b) gives the correct formula because a Ca$^{2+}$ ion with a Cl$^{-}$ ion yields CaCl$_{2}$ Choice (c) gives the correct formula because a Al$^{3+}$ ion with a Cl$^{-}$ ion yields AlCl$_{3}$ Choice (d) gives the correct formula because a Rb$^{+}$ ion with a Cl$^{-}$ ion yields RbCl Therefore Choice (a) is incorrect because a Mg$^{2+}$ ion with a Cl$^{-}$ ion yields MgCl$_{2}$ not MgCl

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