Multiple Choice
Which of the following is the correct formula for the ionic compound formed between magnesium and chlorine?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct chemical formula for calcium bromide?
A
CaBr2
B
CaBr
C
Ca2Br2
D
Ca2Br
Verified step by step guidance1
Identify the charges of the ions involved: calcium typically forms a Ca^{2+} ion, and bromine forms a Br^{-} ion.
Determine the ratio of ions needed to balance the overall charge to zero. Since calcium has a +2 charge and bromide has a -1 charge, two bromide ions are needed to balance one calcium ion.
Write the chemical formula by placing the calcium ion symbol first, followed by the bromide ion symbol with a subscript indicating the number of bromide ions needed to balance the charge.
The resulting formula is CaBr_{2}, indicating one calcium ion combined with two bromide ions.
Verify that the total positive and negative charges balance out: +2 from Ca^{2+} and 2 × (-1) from 2 Br^{-} ions equals zero, confirming the formula is electrically neutral.
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