# Question 7086b

May 2, 2014

The formula for calcium fluoride is $C a {F}_{2}$

Calcium is an Alkaline Earth Metal in the second column of the periodic table. This means that calcium has 2 valence electrons it readily gives away in order to seek the stability of the octet. This makes calcium a $C {a}^{+ 2}$ cation.

Fluorine is a Halogen in the 17th column or ${p}^{5}$ group.
Fluorine has 7 valence electrons. 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 $C {a}^{+} 2$ cation.

This makes the formula for calcium chloride, $C a {F}_{2}$.