Multiple Choice
Which of the following is the correct chemical formula for aluminum(III) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for nickel(II) fluoride?
A
Ni2F2
B
Ni2F
C
NiF
D
NiF2
Verified step by step guidance1
Identify the charge on the nickel ion in nickel(II) fluoride. The (II) indicates that nickel has a +2 charge, so the ion is Ni^{2+}.
Determine the charge on the fluoride ion. Fluoride is the ion form of fluorine and has a charge of -1, so the ion is F^{-}.
To write the correct chemical formula, balance the total positive and negative charges so the compound is electrically neutral.
Since Ni^{2+} has a +2 charge and F^{-} has a -1 charge, you need two fluoride ions to balance one nickel ion, resulting in the formula NiF_2.
Verify that the formula NiF_2 has a net charge of zero: (+2) + 2(-1) = 0, confirming it is the correct formula for nickel(II) fluoride.
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