Question

The most active of all the chemical elements is a halogen known as

Answer 1

Fluorine! It's highly reactive, since it has 7 electrons and wants an extra electron to fill its valence shell. 

Answer 2

Fluorine

Step-by-step explanation:

Fluorine is the most active and the most reactive element of all the elements in the halogen family. They are given the name halogen because they react with other elements to form different salts or salites. "hal" means salt and "gen" means to produce in Greek. Halogens are not found in free form in the nature because of their great reactivity property.

Thus, fluorine is the most active halogen of all.