Multiple Choice
Which of the following correctly identifies the symbol and name of the cation present in table salt?
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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 bromide?
A
Al2Br3
B
AlBr3
C
AlBr
D
Al2Br6
Verified step by step guidance1
Step 1: Identify the charges of the ions involved. Aluminum typically forms a +3 charge (Al^{3+}), and bromide forms a -1 charge (Br^{-}).
Step 2: To write the correct formula, balance the total positive and negative charges so that the compound is electrically neutral.
Step 3: Since aluminum has a +3 charge and bromide has a -1 charge, you need three bromide ions to balance one aluminum ion.
Step 4: Write the formula by placing the aluminum symbol first, followed by the bromide symbol with the appropriate subscript to indicate the number of bromide ions: AlBr_{3}.
Step 5: Verify that the total positive charge (+3 from Al) balances the total negative charge (3 × -1 from Br), confirming the formula AlBr_{3} is correct.
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