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  4. Which of the following halogen is solid at room temperature?

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Q. Which of the following halogen is solid at room temperature?

The p-Block Elements - Part2

Solution:

Fluorine and chlorine having low van der Waals, forces of attraction are gases. $Br _{2}$ is liquid, while iodine with high molecular mass and more van der Waals' force of attraction between the molecules is solid at room temperature.