The most electropositive element in the periodic table is:
Cs
Electropositivity:
Electropositivity can be defined as the ability of an atom to donate electrons and form positively charged cations.
Explanation:
Down the group electropositivity increases.
Among all the elements of the periodic table, alkali metals are considered to be the most electropositive. Cesium is known to be the most electropositive stable element. Hence, option d is the correct answer.