Question

why Flourine is strongest oxidising agent than lithium?

Answer 1

Oxidizing agent is that which can oxidize other species and itself get reduced that is which have a strong tendency to gain the electrons. Fluorine has a strong tendency for gaining a electron. Therefore, it acts as a strong oxidizing agent.

Moreover,fluorine is most electronegative element and smaller in size. These properties make fluorine strongest oxidizing agent as compare to lithium.