Question

Which from following elements of halogen family is in liquid state at room temperature?

• A. Iodine
• B. Astatine
• C. Bromine
• D. Fluorine

Hint:

There are only two liquid elements at standard room temperature in the entire periodic table: Mercury (Hg), which is a metallic conductor, and Bromine ($\text{Br}_2$), which is a non-metallic halogen!

Answer 1

The Correct Option is C

Step 1: Recall the trend.
Going down Group 17, the halogens change from gas to liquid to solid as the molecules get bigger and the forces between them grow.

Step 2: Place each.
Fluorine and chlorine are gases, iodine and astatine are solids. Bromine sits in between.

Step 3: Pick.
Bromine is the liquid at room temperature.
\[ \boxed{\text{Bromine, option 3}} \]