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Which of the following is the correct formula for an ionic compound formed between Ba^{2+} ions and Cl^{-} ions?
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3. Chemical Reactions
Writing Ionic Compounds
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Which of the following is the correct formula for an ionic compound formed between K^+ and O^{2-} ions?
A
K_2O_2
B
KO
C
KO_2
D
K_2O
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Identify the charges of the ions involved: potassium ion (K^+) has a charge of +1, and oxide ion (O^{2-}) has a charge of -2.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since each K^+ has a +1 charge and O^{2-} has a -2 charge, two K^+ ions are needed to balance one O^{2-} ion.
Write the formula by placing the number of each ion as subscripts: two potassium ions and one oxide ion gives the formula \(K_2O\).
Verify that the total positive charge (+2 from two K^+) balances the total negative charge (-2 from one O^{2-}), confirming the compound is neutral.
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