Discussion
Which of the following is in liquid form at room temperature?
Answer: C
Francium is the element listed that is liquid at or near room temperature, melting at about 27°C.
It is intensely radioactive and its longest-lived isotope has a half-life of 22 minutes, so only trace quantities have ever existed at one time. Caesium, at 28.5°C, and gallium, at 29.8°C, behave similarly.
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