which of the following represents most electropositive element

a- [He]2s1

b-[He]2s2

c-[Xe]6s1

d- [Xe]6s2

The correct option is (c). Option (c) represents Cesium which is the most electropositive element.
(a) represents Lithium, (b) represents Boron and (d) represents Barium.
As alkali metals are more electropositive than alkaline earth metals. Electropositive character increases down the group due to which Lithium is less electropositive than Cesium.

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