Video Transcript
The images below show three halogens as they exist at room temperature and standard pressure. Which of the images corresponds to bromine?
The halogens can be found in group 17 of the periodic table. Therefore, fluorine, chlorine, bromine, iodine, and astatine are halogens. Fluorine exists as a pale-yellow gas at room temperature and standard pressure, whereas chlorine is a green gas. Therefore, it is likely that image A corresponds to chlorine. Bromine appears as a red-brown liquid at room temperature and standard pressure. Thus, it is likely that image B corresponds to bromine. Let’s confirm by looking at iodine and astatine.
Iodine is an almost-black solid, so it is likely that image C corresponds to iodine. Astatine is unstable and has not been observed in bulk at room temperature and standard pressure. However, it is assumed that astatine would be a black solid. As bromine is a red-brown liquid at room temperature and standard pressure, then image B, a beaker containing a brownish liquid, corresponds to bromine.
