What is produced when calcium reacts with fluorine in a synthesis reaction? Ca plus cap f sub 2 rightarrow ________

Calcium forms a Ca²⁺ ion, while fluorine forms F⁻ ions. Two fluoride ions are needed to balance the +2 charge of one calcium ion, so the product formula is CaF₂. The synthesis reaction is Ca + F₂ → CaF₂, which is choice A.

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