Identify the number of electrons found in the outermost shell of halogen.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. seven.
Halogens, which belong to Group 17 of the periodic table, have 7 electrons in their outermost shell. This configuration gives them high reactivity as they are one electron short of completing their valence shell, making them highly electronegative and eager to gain one more electron to achieve a stable electronic configuration. This property is characteristic of the halogen group, which includes elements like fluorine, chlorine, bromine, iodine, and astatine.