Multiple Choice
Which noble gas has the same electron configuration as the ion Cl^-?
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2. Atoms & Elements
Ions
Multiple Choice
Which of the following correctly identifies the cation and anion present in the compound CrO2?
A
Cr^{6+} (cation) and O^{2-} (anion)
B
Cr^{3+} (cation) and O_2^{-} (anion)
C
Cr^{2+} (cation) and O_2^{2-} (anion)
D
Cr^{4+} (cation) and O^{2-} (anion)
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Verified step by step guidance1
Identify the chemical formula given: \(\mathrm{CrO_2}\). This compound contains chromium (Cr) and oxygen (O).
Recall that oxygen typically forms anions with a charge of \$2-$, so each oxygen atom is \(\mathrm{O^{2-}}\).
Since there are two oxygen atoms, the total negative charge contributed by oxygen is \(2 \times (-2) = -4\).
To balance the overall charge of the compound (which is neutral), the chromium cation must have a charge of \(+4\) to offset the \(-4\) from oxygen.
Therefore, the cation is \(\mathrm{Cr^{4+}}\) and the anion is \(\mathrm{O^{2-}}\).
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