The halogens are the only periodic group that contains all three phases of matter under normal conditions.

Name: The halogens are the only periodic group that contains all three phases of matter under normal conditions.
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Quizplus · Accepted Answer

This is true. The halogens (fluorine, chlorine, bromine, iodine, and astatine) are the only periodic group that includes a solid (iodine), a liquid (bromine), and several gases (fluorine, chlorine, and astatine) at standard temperature and pressure (STP).

The Halogens Are the Only Periodic Group That Contains All