# Chapter 6 - Ionic and Molecular Compounds - 6.1 Ions: Transfer of Electrons - Questions and Problems - Page 189: 6.6

a. $O^{2-}$ b. $K^+$ c. $Br^{-}$ d. $Sn^{4+}$

#### Work Step by Step

1. Identify each symbol using a periodic table: a. 8 protons = O b. 19 protons = K c. 35 protons = Br d. 50 protons = Sn 2. Calculate the charge of each ion. charge = $nº protons$ - $nº e^-$ a. 8 - 10 = - 2 b. 19 - 18 = + 1 c. 35 - 36 = - 1 d. 50 - 46 = + 4 3. Write the charge in the upper right of the symbol. If it is equal to +1 or -1, you don't need to write the $1$. (Put the number before the $\pm$) a. $O^{2-}$ b. $K^+$ c. $Br^{-}$ d. $Sn^{4+}$

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