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As may be seen in the microscopic view of liquid bromine, 1  Liquids are made up of very small particles (atoms, molecules, and/or ions). 2  The particles that make up a liquid: 3  are close together with no regular arrangement,  vibrate, move about, and slide past each other.
Two elements are liquid at room temperature (298 K): Bromine (Br), an reddish brown liquid witha suffocating odor, melts at 265.9 K. Mercury (Hg), a toxic metal, melts at 234.32 K. (See Why is mercury a liquid at STP?) Four elements melt just a few degrees above room temperature. Francium (Fr) , a radioactive and extremely reactive metal, melts around 300 K. The false color image at left shows 10,000 francium atoms in a laser trap.