Electropositivity is the measure of the ability of elements (mainly metals) to donate electrons to form positive ions. The elements that can easily accept electrons to form negative ions are called electronegative elements, for example: non-metals.
if a highly electro positive element is bondd with other high electro negative element, it creates powerful bond by donating electrons.
Ionic bond will form when highly electropositive element bonded with highly electronegative element.
Ionic bond will formed when one element completely remove electron and donate that electron to other element.
Highly electropositive element easily donate electron and highly electronegative element will easily accept the electron and ionic bond will form.