객관식
What is the correct name for the ionic compound BaCl_2?
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객관식
Which of the following is the correct chemical formula for nickel(II) iodide?
A
NiI
B
Ni2I3
C
NiI2
D
Ni2I
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검증된 단계별 안내1
Identify the charge on the nickel ion in nickel(II) iodide. The (II) indicates that nickel has a +2 charge, so the ion is Ni^{2+}.
Determine the charge on the iodide ion. Iodide is a halide ion with a charge of -1, so the ion is I^{-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
Since Ni^{2+} has a +2 charge and I^{-} has a -1 charge, you need two iodide ions to balance one nickel ion.
Combine the ions accordingly to get the formula NiI_{2}, which shows one nickel ion combined with two iodide ions.
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