Multiple Choice
Which element, when combined with fluorine, would most likely form an ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct formula for the ionic compound formed between lithium and bromide?
A
LiBr2
B
Li2Br2
C
Li2Br
D
LiBr
Verified step by step guidance1
Identify the charges of the ions involved: lithium (Li) typically forms a +1 cation (Li\^{+}), and bromide (Br) forms a -1 anion (Br\^{-}).
Determine the ratio of ions needed to balance the overall charge of the compound. Since Li\^{+} has a +1 charge and Br\^{-} has a -1 charge, they combine in a 1:1 ratio to make a neutral compound.
Write the formula by placing the cation first followed by the anion, using subscripts to indicate the number of each ion if more than one is needed. Here, since the charges balance 1:1, no subscripts are needed beyond 1.
Check the options given: LiBr2 implies two bromide ions per lithium ion, which would give a net charge of -1; Li2Br implies two lithium ions per bromide ion, giving a net charge of +1; Li2Br2 can be simplified to LiBr, but is not the conventional way to write the formula.
Conclude that the correct formula is LiBr, representing one lithium ion combined with one bromide ion to form a neutral ionic compound.
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