Write the formula for each ionic compound. d. calcium fluoride

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Identify the symbols for the elements involved: Calcium (Ca) and Fluorine (F).

Determine the charge of each ion. Calcium typically forms a +2 cation (Ca^2+), and Fluorine typically forms a -1 anion (F^-).

Combine the ions in a ratio that neutralizes the total charge. Since Calcium has a +2 charge and each Fluorine has a -1 charge, you will need two Fluorine ions to balance one Calcium ion.

Write the formula by placing the cation first followed by the anion. Since you need two Fluorine ions for each Calcium ion, the formula will include a subscript 2 after the symbol for Fluorine.

The chemical formula for calcium fluoride is CaF_2.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ionic Compounds

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of positively charged cations and negatively charged anions. These oppositely charged ions attract each other, creating a stable compound. The overall charge of the compound is neutral, meaning the total positive charge equals the total negative charge.

Calcium and Fluoride Ions

Calcium (Ca) is a metal that typically loses two electrons to form a Ca²⁺ cation, while fluoride (F) is a non-metal that gains one electron to form an F⁻ anion. The combination of these ions is essential for forming calcium fluoride, as the charges must balance to create a neutral compound.

Chemical Formula Representation

The chemical formula of an ionic compound indicates the ratio of the constituent ions. For calcium fluoride, the formula is CaF₂, which shows that one calcium ion combines with two fluoride ions to achieve electrical neutrality. This notation is crucial for understanding the composition and stoichiometry of the compound.

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