Explain the formation of CaF2.

Asked by Topperlearning User | 24th Jul, 2017, 02:20: PM

Expert Answer:

Atomic Number of Ca is 20.

Electronic Configuration of Ca : 2, 8, 8, 2
 
When Calcium loses two electrons, it becomes Ca2+ and attains stable electronic arrangement of argon.
Now,            

Ca → Ca2+   + 2e- 

Atomic Number of F = 9

Electronic Configuration of F : 2, 7
 
Fluorine on gaining one electron forms an anion F- and attains stable electronic arrangement of neon.
                                     F + e- → F-
The oppositely charged ions are held together by strong electrostatic forces of attraction as shown :-
 

Answered by  | 24th Jul, 2017, 04:20: PM