Which element is most reactive?

Name: Which element is most reactive?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Reactivity of an element is related to its tendency to lose or gain electrons. Potassium (K) belongs to group 1 of the periodic table and has only one electron in its outermost shell, making it very reactive. The other options have a higher atomic number and therefore more electrons in their outermost shell, making them less reactive than potassium.

Which Element Is Most Reactive