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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.
Fluorine (F2) and chlorine (Cl2) are gases at room temperature. Bromine (Br2) is a reddish-brown liquid at room temperature and isâapart from mercuryâthe only element that is liquid at 20 Â°C (68 Â°F) and atmospheric pressure. Iodine (I2) forms dark violet crystals under these conditions.