Multiple Choice
Which of the following is the correct chemical formula for strontium sulfide?
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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
Al2Br6
B
Al2Br3
C
AlBr
D
AlBr3
Verified step by step guidance1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and bromide forms a -1 charge (Br^{-}).
To form a neutral compound, the total positive charge must balance the total negative charge.
Since aluminum has a +3 charge and bromide has a -1 charge, you need three bromide ions to balance one aluminum ion.
Write the chemical formula by combining one aluminum ion with three bromide ions, resulting in AlBr_{3}.
Verify that the formula is electrically neutral: (1 \times +3) + (3 \times -1) = 0, confirming AlBr_{3} is correct.
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