Which of the following is the most electropositive element?

Correct option is A

The correct answer is (A) Cs (Cesium).

·         Electropositivity refers to an element's tendency to lose electrons and form positive ions. The most electropositive elements are typically found in Group 1 (alkali metals) of the periodic table because they have only one valence electron, which is easily lost.

Among the given options:

• Cesium (Cs): It is the most electropositive element due to its large atomic size and low ionization energy, making it easier to lose its single valence electron.
• Calcium (Ca): While electropositive, it is less so than cesium because it belongs to Group 2 (alkaline earth metals) and has two valence electrons.
• Sodium (Na): It is highly electropositive but less than cesium as it is smaller in size.
• Magnesium (Mg): Like calcium, it belongs to Group 2 and is less electropositive than the Group 1 elements.

Order of Electropositivity:

Cs > Na > Ca > Mg