Question

Which of the following group elements contains solid, liquid, and gas phases at $298K$ and $1$ atm?

• A. $18$
• B. $2$
• C. $17$
• D. $16$
• E. $1$

Answer 1

Answer: (C)

$17$

The elements of group $17$ (halogens) exist, at room temperature, in all three states of matter:

Solid- Iodine, Astatine

Liquid- Bromine

Gas- Fluorine, Chlorine