Which of the following is NOT a halogen gas?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. He.
Helium is a noble gas belonging to Group 18 of the periodic table. It is colorless, odorless, and chemically inert, meaning it does not easily react with other elements.
On the other hand, Fluorine (F), Chlorine (Cl), and Bromine (Br) are halogens, which belong to Group 17. Halogens are highly reactive nonmetals and exist in different states—Fluorine and Chlorine as gases, Bromine as a liquid at room temperature.