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The formula for calcium fluoride is ##CaF_2##
Calcium is an Alkaline Earth Metal in the second column of . This means that calcium has 2 it readily gives away in order to seek the stability of the octet. This makes calcium a ##Ca^(+2)## cation.
Fluorine is a Halogen in the 17th column or ##p^5## group.
Fluorine has 7 . It needs one electron to make it stable at 8 electrons in its valence shells. This makes fluorine a ##F^(−1 )## anion.
Ionic bonds form when the charges between the metal cation and non-metal anion are equal and opposite. This means that two ##F^(−1)## anions will balance with one ##Ca^+2## cation.
This makes the formula for calcium chloride, ##CaF_2##.
I hope this is helpful.
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