Multiple Choice
What is the systematic name of Mg(NO3)2?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for aluminum iodide?
A
AlI
B
AlI3
C
Al2I3
D
Al3I2
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and iodide forms a -1 charge (I^{-}).
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Since aluminum has a +3 charge and iodide has a -1 charge, you need three iodide ions to balance one aluminum ion.
Write the chemical formula by placing the aluminum symbol first, followed by the iodide symbol with the subscript indicating the number of iodide ions needed: AlI_{3}.
Confirm that the total positive charge (+3 from Al) balances the total negative charge (3 × -1 from I), ensuring the compound is neutral.
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