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Why is CaF2 not a molecular formula? Which of the following is not an example of a molecular formula? a. H2O c. CaF2 b. NH3 d. O2 The answer is C and I am confused as to why.

Chemistry
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CaF2 is an ionic compound, since its the only substance in ur group that is formed with a non-melta and a metal
this link should help: http://wiki.answers.com/Q/What_is_the_difference_between_an_ionic_and_a_molecular_compound
however that is a very condensed review I recommend this book: Chemistry, A central Science

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Oh, I see. Thank you!
The fastest way to tell the difference between a molecular formula and a formula unit is to look at the composition of the particle. If the elements are both nonmetals, it is a molecule. If the elements contain a metal, it is ionic. C has the only instance of a metal and a nonmetal; thus it is an ion.

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