Ca cannot be used to isolate Cs from molten CsX as Cs is highly electropositive.
Electropositivity is mostly displayed by metallic elements, especially the alkali metals and the alkaline earth metals. "Electropositivity can be described as the tendency of an atom to donate electrons and produce positively charged cations."In contrast to electronegativity, which measures an atom's propensity to gain electrons and produce negatively charged anions, it is vital to emphasize that electropositivity is the reverse of this property.
As a result, highly electronegative elements have extremely low electropositivity while highly electropositive elements have extremely low electronegativities.(Electropositive elements often do not gain electrons to form anions, and electronegative elements typically do not have a tendency to lose electrons to form cations.)
Ionic salts between electropositive and electronegative elements are frequently formed.
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