객관식
Which of the following is the correct chemical formula for aluminum nitrate?
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3. Chemical Reactions
Naming Ionic Compounds
객관식
Which of the following is the correct formula for the ionic compound formed between magnesium and sulfur?
A
MgS
B
Mg_2S_2
C
MgS_2
D
Mg_2S
검증된 단계별 안내1
Identify the charges of the ions formed by magnesium and sulfur. Magnesium typically forms a \(\mathrm{Mg^{2+}}\) ion, and sulfur typically forms a \(\mathrm{S^{2-}}\) ion.
Determine the ratio of ions needed to balance the overall charge of the compound. Since \(\mathrm{Mg^{2+}}\) has a +2 charge and \(\mathrm{S^{2-}}\) has a -2 charge, one \(\mathrm{Mg^{2+}}\) ion will balance one \(\mathrm{S^{2-}}\) ion.
Write the formula by combining the ions in the ratio that balances the charges. Because the charges are equal and opposite, the formula is simply \(\mathrm{MgS}\) with no additional subscripts needed.
Check the other options to see if they represent the same ratio or if they imply different charge balances. For example, \(\mathrm{Mg_2S_2}\) simplifies to \(\mathrm{MgS}\), but it is not the conventional way to write the formula.
Conclude that the correct formula for the ionic compound formed between magnesium and sulfur is \(\mathrm{MgS}\), reflecting the 1:1 ratio of \(\mathrm{Mg^{2+}}\) to \(\mathrm{S^{2-}}\) ions.
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