Question

Which of the following is the most chemically reactive?

• A. $Li$
• B. $Na$
• C. $K$
• D. $Rb$
• E. $Cs$

Answer 1

The correct option is E $Cs$

$Cs$ is the most chemically reactive among alkali metals. On moving down the group of alkali metals, the electropositive character increases. Thus $Cs$ is most electropositive element. It has maximum tendency to lose electron.