Multiple Choice
Which of the following is the correct chemical formula for copper(II) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the metallic ion present in sodium fluoride?
A
Mg^{2+}
B
F^-
C
Ca^{2+}
D
Na^+
Verified step by step guidance1
Identify the compound given: sodium fluoride (NaF). This compound consists of sodium (Na) and fluoride (F) ions.
Recall that in ionic compounds, the metal typically forms a positive ion (cation) and the non-metal forms a negative ion (anion).
Determine the ions present in sodium fluoride: sodium (Na) forms a cation with a charge of +1, written as $Na^{+}$, and fluoride (F) forms an anion with a charge of -1, written as $F^{-}$.
Compare the given options with the ions in sodium fluoride. The options $Mg^{2+}$ and $Ca^{2+}$ are metal ions but are not part of sodium fluoride.
Conclude that the metallic ion present in sodium fluoride is $Na^{+}$, the sodium ion.
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