Discussion
The most electropositive elements among the following is
Answer: D
Caesium is the most electropositive of the four.
Electropositive character - the tendency to lose an electron - increases down a group as the atom grows larger and the outer electron is more shielded, and decreases across a period. Cs lies lowest in Group 1 among these, so its ionisation energy is the smallest. Francium is more electropositive still but is radioactive and vanishingly rare.
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