Respuesta :
Ionic compounds are compounds made up of elements in which one has the tendency to loose electrons whereas the other has the tendency to gain electrons. Loss of electron results in the formation of a positively charged ion (cation) while gain of electrons results in the formation of negatively charged ions (anions). Usually metals have the tendency to loose electrons and non-metals tend to gain electrons.
Calcium (Ca) is a metal and belongs to group IIA in the periodic table with a valence electron configuration of 4s2
Fluorine (F) is a non-metal and belongs to group VIIA in the periodic table with a valence configuration of 2s22p5.
Thus, Ca will donate its outer 2 electrons to F, thus allowing each of the electronegative F atoms to complete its octet.
Therefore, we have:
Ca2+ + F- ------ CaF2
Ions bond together by an attractive force between oppositely charged ions is called ionic compounds. The expected formula between the element is [tex]\rm CaF_{2}[/tex].
What is ionic bonding?
Ionic compounds are formed when one species or atom losses electrons and the other gains the electron to form an ion.
The species that loses electrons are called cations and have a positive charge while the species that gains electrons are called anions and have a negative charge.
Calcium is the metallic element that has valence shell electron configuration as, [tex]\rm 4s^{2}[/tex]. While Flourine is a non-metal that has a configuration of [tex]\rm 2s^{2}2p^{5}[/tex].
Here calcium atom will donate its outer 2 electrons to fluorine to attain the complete octet state and can be shown as,
[tex]\rm Ca^{2+} + F^{-} \rightarrow CaF_{2}[/tex]
Therefore, [tex]\rm CaF_{2}[/tex] will be formed.
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