Question

what is the name of the compound caf₂
a none of these are correct
b carbon fluoride
c calcium flurine
d calcium fluoride

Explanation:

To name the ionic compound \( \text{CaF}_2 \), we identify the cation and anion. The cation is \( \text{Ca}^{2+} \) (calcium ion), and the anion is \( \text{F}^- \) (fluoride ion, since fluorine gains one electron to form \( \text{F}^- \), and its name becomes fluoride). Ionic compounds are named by stating the cation first (using the element's name) followed by the anion (using the element's root name with the suffix -ide). So, \( \text{CaF}_2 \) is calcium fluoride. Option b is incorrect because it uses carbon (not calcium), option c misspells "fluorine" as "flurine" and uses the element name instead of the anion name, and option d is the correct name.

Answer:

d. Calcium fluoride