➷ It would be CaCl2
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Explanation:
Atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2. So, to acquire stability it loses 2 valence electrons and hence forms [tex]Ca^{2+}[/tex] ion.
Whereas atomic number of calcium is 17 and its electronic distribution is 2, 8, 7. To attain stability its needs to gain one electron and hence then it forms [tex]Cl^{-}[/tex] ion.
Therefore, when both calcium and chlorine chemically combine together then they will form calcium chloride, that is, [tex]CaCl_{2}[/tex].
Thus, we can conclude that the chemical formula of calcium chloride is [tex]CaCl_{2}[/tex].
